f

mnemo_cards_admin/@/components/ui/button.tsx

@@ -53,4 +53,5 @@ const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
 )
 Button.displayName = "Button"
 
+// eslint-disable-next-line react-refresh/only-export-components
 export { Button, buttonVariants }

mnemo_cards_admin/@/components/ui/form.tsx

@@ -1,3 +1,4 @@
+/* eslint-disable react-refresh/only-export-components */
 import * as React from "react"
 import * as LabelPrimitive from "@radix-ui/react-label"
 import { Slot } from "@radix-ui/react-slot"

mnemo_cards_admin/src/api/auth.ts

@@ -1,5 +1,6 @@
 import { adminApiClient } from './client'
 import type { AuthResponse, RequestCodeResponse, CodeStatusResponse } from '@/types/models'
+import type { AxiosError } from 'axios'
 
 export const authApi = {
   // Request authentication code (creates web code)
@@ -13,9 +14,10 @@ export const authApi = {
     try {
       const response = await adminApiClient.get(`/api/v2/admin/auth/code-status/${code}`)
       return response.data
-    } catch (error: any) {
+    } catch (error) {
+      const axiosError = error as AxiosError
       // If 404, return a proper error response
-      if (error.response?.status === 404) {
+      if (axiosError.response?.status === 404) {
         return {
           success: false,
           code: code,
@@ -40,7 +42,7 @@ export const authApi = {
   },
 
   // Get current admin info (for token validation)
-  getCurrentUser: async (): Promise<{ success: boolean; user?: any; message?: string }> => {
+  getCurrentUser: async (): Promise<{ success: boolean; user?: unknown; message?: string }> => {
     const response = await adminApiClient.get('/api/v2/admin/auth/me')
     return response.data
   },

mnemo_cards_admin/src/api/client.test.ts

@@ -44,8 +44,8 @@ describe('API Clients', () => {
       const token = 'test-admin-token'
       localStorage.setItem('admin_token', token)
 
-      const requestConfig = { headers: {} }
-      const addAuthToken = (config: any) => {
+      const requestConfig = { headers: {} as Record<string, string> }
+      const addAuthToken = (config: { headers: Record<string, string> }) => {
         const storedToken = localStorage.getItem('admin_token')
         if (storedToken) {
           config.headers.Authorization = `Bearer ${storedToken}`
@@ -58,8 +58,8 @@ describe('API Clients', () => {
     })
 
     it('should not add authorization header when no token exists', () => {
-      const requestConfig = { headers: {} }
-      const addAuthToken = (config: any) => {
+      const requestConfig = { headers: {} as Record<string, string> }
+      const addAuthToken = (config: { headers: Record<string, string> }) => {
         const storedToken = localStorage.getItem('admin_token')
         if (storedToken) {
           config.headers.Authorization = `Bearer ${storedToken}`
@@ -81,7 +81,7 @@ describe('API Clients', () => {
         writable: true,
       })
 
-      const handleAuthError = (error: any) => {
+      const handleAuthError = (error: { response?: { status?: number } }) => {
         if (error.response?.status === 401) {
           localStorage.removeItem('admin_token')
           window.location.href = '/login'
@@ -108,7 +108,7 @@ describe('API Clients', () => {
         writable: true,
       })
 
-      const handleAuthError = (error: any) => {
+      const handleAuthError = (error: { response?: { status?: number } }) => {
         if (error.response?.status === 401) {
           localStorage.removeItem('admin_token')
           window.location.href = '/login'

mnemo_cards_admin/src/api/client.ts

@@ -1,4 +1,4 @@
-import axios from 'axios'
+import axios, { type AxiosError, type InternalAxiosRequestConfig } from 'axios'
 import { useAuthStore } from '@/stores/authStore'
 
 const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || 'https://api.mnemo-cards.online'
@@ -23,7 +23,7 @@ export const adminApiClient = axios.create({
 })
 
 // Request interceptor to add auth token
-const addAuthToken = (config: any) => {
+const addAuthToken = (config: InternalAxiosRequestConfig) => {
   const token = localStorage.getItem('admin_token')
   const isPublicAuthEndpoint = 
     config.url?.includes('/admin/auth/request-code') ||
@@ -33,7 +33,7 @@ const addAuthToken = (config: any) => {
   if (token && token.trim()) {
     // Ensure headers object exists
     if (!config.headers) {
-      config.headers = {}
+      config.headers = {} as InternalAxiosRequestConfig['headers']
     }
     const trimmedToken = token.trim()
     // Set Authorization header - axios will normalize it to lowercase for HTTP
@@ -61,14 +61,15 @@ const addAuthToken = (config: any) => {
 let isLoggingOut = false
 
 // Response interceptor for error handling
-const handleAuthError = (error: any) => {
-  if (error.response?.status === 401) {
+const handleAuthError = (error: unknown) => {
+  const axiosError = error as AxiosError
+  if (axiosError.response?.status === 401) {
     // Check if we're already on login page
     const currentPath = window.location.pathname
     const isPublicAuthEndpoint = 
-      error.config?.url?.includes('/admin/auth/request-code') ||
-      error.config?.url?.includes('/admin/auth/verify-code') ||
-      error.config?.url?.includes('/admin/auth/code-status')
+      axiosError.config?.url?.includes('/admin/auth/request-code') ||
+      axiosError.config?.url?.includes('/admin/auth/verify-code') ||
+      axiosError.config?.url?.includes('/admin/auth/code-status')
     
     // Don't logout for public auth endpoints or if already on login page
     if (currentPath === '/login' || isPublicAuthEndpoint) {

mnemo_cards_admin/src/components/ui/badge.tsx

@@ -33,4 +33,5 @@ function Badge({ className, variant, ...props }: BadgeProps) {
   )
 }
 
+// eslint-disable-next-line react-refresh/only-export-components
 export { Badge, badgeVariants }

mnemo_cards_admin/src/components/ui/button.tsx

@@ -55,4 +55,5 @@ const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
 )
 Button.displayName = "Button"
 
+// eslint-disable-next-line react-refresh/only-export-components
 export { Button, buttonVariants }

mnemo_cards_admin/src/components/ui/input.tsx

@@ -2,8 +2,7 @@ import * as React from "react"
 
 import { cn } from "@/lib/utils"
 
-export interface InputProps
-  extends React.InputHTMLAttributes<HTMLInputElement> {}
+export type InputProps = React.InputHTMLAttributes<HTMLInputElement>
 
 const Input = React.forwardRef<HTMLInputElement, InputProps>(
   ({ className, type, ...props }, ref) => {

mnemo_cards_admin/src/components/ui/textarea.tsx

@@ -2,8 +2,7 @@ import * as React from "react"
 
 import { cn } from "@/lib/utils"
 
-export interface TextareaProps
-  extends React.TextareaHTMLAttributes<HTMLTextAreaElement> {}
+export type TextareaProps = React.TextareaHTMLAttributes<HTMLTextAreaElement>
 
 const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
   ({ className, ...props }, ref) => {

mnemo_cards_admin/src/pages/CardsPage.tsx

@@ -3,6 +3,7 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { toast } from 'sonner'
 import { cardsApi } from '@/api/cards'
 import type { GameCardDto, PaginatedResponse } from '@/types/models'
+import type { AxiosError } from 'axios'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
@@ -71,8 +72,9 @@ export default function CardsPage() {
       toast.success('Card created successfully')
       closeDialog()
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to create card')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to create card')
     },
   })
 
@@ -83,8 +85,9 @@ export default function CardsPage() {
       toast.success('Card updated successfully')
       closeDialog()
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to update card')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to update card')
     },
   })
 
@@ -96,8 +99,9 @@ export default function CardsPage() {
       setIsDeleteDialogOpen(false)
       setCardToDelete(null)
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to delete card')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to delete card')
     },
   })
 

mnemo_cards_admin/src/pages/PacksPage.tsx

@@ -3,6 +3,7 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { toast } from 'sonner'
 import { packsApi } from '@/api/packs'
 import type { EditCardPackDto, CardPackPreviewDto, PaginatedResponse } from '@/types/models'
+import type { AxiosError } from 'axios'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
@@ -77,8 +78,9 @@ export default function PacksPage() {
       toast.success('Pack created successfully')
       closeDialog()
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to create pack')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to create pack')
     },
   })
 
@@ -89,8 +91,9 @@ export default function PacksPage() {
       toast.success('Pack updated successfully')
       closeDialog()
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to update pack')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to update pack')
     },
   })
 
@@ -102,8 +105,9 @@ export default function PacksPage() {
       setIsDeleteDialogOpen(false)
       setPackToDelete(null)
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to delete pack')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to delete pack')
     },
   })
 
@@ -141,7 +145,7 @@ export default function PacksPage() {
         order: fullPack.order || 0,
       })
       setIsDialogOpen(true)
-    } catch (error) {
+    } catch {
       toast.error('Failed to load pack details')
     }
   }

mnemo_cards_admin/src/pages/UsersPage.tsx

@@ -3,6 +3,7 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { toast } from 'sonner'
 import { usersApi } from '@/api/users'
 import type { UserDto, PaginatedResponse, PaymentDto } from '@/types/models'
+import type { AxiosError } from 'axios'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
@@ -71,8 +72,9 @@ export default function UsersPage() {
       toast.success('User updated successfully')
       closeEditDialog()
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to update user')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to update user')
     },
   })
 
@@ -84,8 +86,9 @@ export default function UsersPage() {
       setIsDeleteDialogOpen(false)
       setUserToDelete(null)
     },
-    onError: (error: any) => {
-      toast.error(error.response?.data?.message || 'Failed to delete user')
+    onError: (error: unknown) => {
+      const axiosError = error as AxiosError<{ message?: string }>
+      toast.error(axiosError.response?.data?.message || 'Failed to delete user')
     },
   })
 
@@ -112,7 +115,7 @@ export default function UsersPage() {
       setUserPurchases(purchases)
       setSelectedUser(user)
       setIsPurchasesDialogOpen(true)
-    } catch (error) {
+    } catch {
       toast.error('Failed to load user purchases')
     }
   }

mnemo_cards_admin/src/types/models.ts

@@ -55,8 +55,8 @@ export interface UserDto {
   purchases: string[]
   subscription?: boolean
   subscriptionFeatures: string[]
-  userDataDto?: any
-  userSettingsDto?: any
+  userDataDto?: unknown
+  userSettingsDto?: unknown
 }
 
 export interface PaymentDto {

mnemo_cards_backend/lib/api/purchase/payment_drift_extension.dart

@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 import 'package:mnemo_cards_common/mnemo_cards_common.dart';
 import 'package:drift/drift.dart' as drift;
@@ -32,7 +33,7 @@ extension PaymentToDto on Payment {
       ),
       externalToken: externalToken,
       meta: meta,
-      date: date,
+      date: date.dateTime,
       products: productsList,
     );
   }
@@ -52,7 +53,7 @@ extension PaymentFromDto on PaymentDto {
       paymentSystem: paymentSystem.name,
       externalToken: drift.Value(externalToken),
       meta: drift.Value(meta),
-      date: drift.Value(date),
+      date: drift.Value(PgDateTime(date)),
       products: drift.Value(productsJson),
     );
   }
@@ -65,7 +66,7 @@ extension PaymentUpdate on PaymentDto {
       status: drift.Value(status.name),
       externalToken: drift.Value(externalToken),
       meta: drift.Value(meta),
-      updatedAt: drift.Value(DateTime.now()),
+      updatedAt: drift.Value(PgDateTime(DateTime.now())),
     );
   }
 }

mnemo_cards_backend/lib/api/purchase/payment_manager.dart

@@ -1,4 +1,5 @@
 import 'dart:developer';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/api/purchase/google_play_purchase_handler.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
@@ -69,8 +70,8 @@ class PaymentManager {
           await _db.subscriptionDao.createUserSubscription(
             UserSubscriptionsCompanion.insert(
               userId: userId,
-              start: now,
-              finish: endDate,
+              start: PgDateTime(now),
+              finish: PgDateTime(endDate),
               features: drift.Value(plan.features as List<dynamic>),
             ),
           );
@@ -149,8 +150,8 @@ class PaymentManager {
           await _db.subscriptionDao.createUserSubscription(
             UserSubscriptionsCompanion.insert(
               userId: payment.userId,
-              start: now,
-              finish: endDate,
+              start: PgDateTime(now),
+              finish: PgDateTime(endDate),
               features: drift.Value(plan.features),
             ),
           );

mnemo_cards_backend/lib/api/subscription/subscription_manager.dart

@@ -1,3 +1,4 @@
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
@@ -25,8 +26,8 @@ class SubscriptionManager {
     return SubscriptionDto(
       page: null,
       isActive: subscription != null,
-      start: subscription?.start,
-      finish: subscription?.finish,
+      start: subscription?.start.dateTime,
+      finish: subscription?.finish.dateTime,
     );
   }
 
@@ -41,8 +42,8 @@ class SubscriptionManager {
     await _db.subscriptionDao.createUserSubscription(
       UserSubscriptionsCompanion.insert(
         userId: user.id!,
-        start: now,
-        finish: endDate,
+        start: PgDateTime(now),
+        finish: PgDateTime(endDate),
         features: const Value([]),
       ),
     );
@@ -86,8 +87,8 @@ class SubscriptionManager {
     await _db.subscriptionDao.createUserSubscription(
       UserSubscriptionsCompanion.insert(
         userId: userId,
-        start: now,
-        finish: endDate,
+        start: PgDateTime(now),
+        finish: PgDateTime(endDate),
         features: Value(plan.features as List<dynamic>),
       ),
     );

mnemo_cards_backend/lib/api/v2/admin_analytics_api_v2.dart

@@ -71,7 +71,7 @@ class AdminAnalyticsApiV2 {
                 'id': u.id,
                 'name': u.name,
                 'email': u.email,
-                'createdAt': u.createdAt.toIso8601String(),
+                'createdAt': u.createdAt.dateTime.toIso8601String(),
               })
           .toList();
 

mnemo_cards_backend/lib/api/v2/admin_cards_api_v2.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:shelf/shelf.dart';
 import 'package:shelf_router/shelf_router.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
@@ -41,9 +42,9 @@ class AdminCardsApiV2 {
             'image': card.image,
             'back': card.back,
             'transcription': card.transcription,
-            'createdAt': card.createdAt.toIso8601String(),
+            'createdAt': card.createdAt.dateTime.toIso8601String(),
           }).toList(),
-          'total': total,
+          'total': total, 
         }),
         headers: {'Content-Type': 'application/json'},
       );
@@ -83,8 +84,8 @@ class AdminCardsApiV2 {
           'image': card.image,
           'back': card.back,
           'transcription': card.transcription,
-          'createdAt': card.createdAt.toIso8601String(),
-          'updatedAt': card.updatedAt?.toIso8601String(),
+          'createdAt': card.createdAt.dateTime.toIso8601String(),
+          'updatedAt': card.updatedAt?.dateTime.toIso8601String(),
         }),
         headers: {'Content-Type': 'application/json'},
       );
@@ -155,7 +156,7 @@ class AdminCardsApiV2 {
         image: data['image'] ?? existing.image,
         back: data['back'] ?? existing.back,
         transcription: data['transcription'] ?? existing.transcription,
-        updatedAt: DateTime.now(),
+        updatedAt: PgDateTime(DateTime.now()),
       );
 
       await _db.packDao.updateCard(updated);

mnemo_cards_backend/lib/api/v2/jwt_service.dart

@@ -3,6 +3,7 @@ import 'dart:io';
 import 'dart:math';
 
 import 'package:crypto/crypto.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
@@ -245,7 +246,7 @@ class JwtService {
         RefreshTokensCompanion.insert(
           jti: jti,
           userId: userId,
-          expiresAt: expiresAt, // required field - raw DateTime
+          expiresAt: PgDateTime(expiresAt), // required field - raw DateTime
           // createdAt and isBlacklisted use defaults from table
         ),
       );
@@ -260,7 +261,7 @@ class JwtService {
     }
 
     // Check if expired
-    if (token.expiresAt.isBefore(DateTime.now())) {
+    if (token.expiresAt.dateTime.isBefore(DateTime.now())) {
       return true; // Expired tokens are considered invalid
     }
 

mnemo_cards_backend/lib/api/v2/tasks_api_v2.dart

@@ -4,7 +4,6 @@ import 'dart:developer';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/api/authorize/helpers.dart';
 import 'package:mnemo_cards_backend/tasks/task_manager.dart';
-import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
 import 'package:shelf/shelf.dart';
 import 'package:shelf_router/shelf_router.dart';
 
@@ -104,9 +103,9 @@ class TasksApiV2 {
         'difficulty': t.difficulty,
         'status': t.status,
         'rewards': t.rewards,
-        'createdAt': t.createdAt.toIso8601String(),
-        'expiresAt': t.expiresAt.toIso8601String(),
-        'completedAt': t.completedAt?.toIso8601String(),
+        'createdAt': t.createdAt.dateTime.toIso8601String(),
+        'expiresAt': t.expiresAt.dateTime.toIso8601String(),
+        'completedAt': t.completedAt?.dateTime.toIso8601String(),
         'proofUrl': t.proofUrl,
         'instructions': t.instructions,
         'tags': t.tags,
@@ -146,9 +145,9 @@ class TasksApiV2 {
           'difficulty': task.difficulty,
           'status': task.status,
           'rewards': task.rewards,
-          'createdAt': task.createdAt.toIso8601String(),
-          'expiresAt': task.expiresAt.toIso8601String(),
-          'completedAt': task.completedAt?.toIso8601String(),
+          'createdAt': task.createdAt.dateTime.toIso8601String(),
+          'expiresAt': task.expiresAt.dateTime.toIso8601String(),
+          'completedAt': task.completedAt?.dateTime.toIso8601String(),
           'proofUrl': task.proofUrl,
           'instructions': task.instructions,
           'tags': task.tags,
@@ -212,8 +211,8 @@ class TasksApiV2 {
         'progress': progress.map((p) => {
           'taskId': p.taskId,
           'progress': p.progress,
-          'startedAt': p.startedAt.toIso8601String(),
-          'updatedAt': p.updatedAt.toIso8601String(),
+          'startedAt': p.startedAt.dateTime.toIso8601String(),
+          'updatedAt': p.updatedAt.dateTime.toIso8601String(),
         }).toList()
       });
     } catch (e) {

mnemo_cards_backend/lib/api/v2/telegram_bot_api_v2.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'dart:math';
 
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 import 'package:mnemo_cards_backend/main.dart' as backend_main;
@@ -115,8 +116,8 @@ class TelegramBotApiV2 {
       final sharesCount = await (_db.selectOnly(_db.shareRequests)
             ..addColumns([countExpr])
             ..where(_db.shareRequests.telegramUserId.equals(telegramUserId))
-            ..where(_db.shareRequests.requestedAt.isBiggerOrEqualValue(todayStart))
-            ..where(_db.shareRequests.requestedAt.isSmallerThanValue(todayEnd)))
+            ..where(_db.shareRequests.requestedAt.isBiggerOrEqualValue(PgDateTime(todayStart)))
+            ..where(_db.shareRequests.requestedAt.isSmallerThanValue(PgDateTime(todayEnd))))
           .map((row) => row.read(countExpr)!)
           .getSingle();
 
@@ -155,7 +156,7 @@ class TelegramBotApiV2 {
         telegramUserId: telegramUserId,
         telegramUsername: Value(telegramUsername),
         sharedCardId: Value(sharedCardId),
-        requestedAt: Value(requestedAt),
+        requestedAt: Value(PgDateTime(requestedAt)),
       );
 
       await _db.into(_db.shareRequests).insert(companion);

mnemo_cards_backend/lib/api/v2/users_api_v2.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'dart:math';
 
 import 'package:drift/drift.dart' as drift;
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/api/authorize/helpers.dart';
 import 'package:mnemo_cards_backend/api/purchase/payment_manager.dart';
@@ -117,7 +118,7 @@ class UsersApiV2 {
         id: drift.Value(user.id!),
         name: name != null ? drift.Value(name) : const drift.Value.absent(),
         email: email != null ? drift.Value(email) : const drift.Value.absent(),
-        updatedAt: drift.Value(DateTime.now()),
+        updatedAt: drift.Value(PgDateTime(DateTime.now())),
       ),
     );
 
@@ -518,8 +519,8 @@ class UsersApiV2 {
             totalStudyTimeMinutes: drift.Value(totalStudyTime),
             currentStreak: drift.Value(currentStreak),
             longestStreak: drift.Value(longestStreak),
-            lastTimeOnline: drift.Value(now),
-            updatedAt: drift.Value(now),
+            lastTimeOnline: drift.Value(PgDateTime(now)),
+            updatedAt: drift.Value(PgDateTime(now)),
           ),
         );
       });

mnemo_cards_backend/lib/cron/check_admins.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:mnemo_cards_backend/user/admin_ids_service.dart';
 
 import '../database/database.dart';
@@ -41,7 +42,7 @@ class CheckAdminsTask with task.Task {
               UsersCompanion(
                 id: Value(user.id),
                 admin: const Value(true),
-                updatedAt: Value(DateTime.now()),
+                updatedAt: Value(PgDateTime(DateTime.now())),
               ),
             );
           }

mnemo_cards_backend/lib/cron/tasks_seeder.dart

@@ -1,6 +1,8 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:mnemo_cards_backend/cron/task.dart' as cron_task;
 import 'package:mnemo_cards_backend/database/database.dart';
+import 'package:mnemo_cards_common/mnemo_cards_common.dart';
 import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
 
 class TasksSeederTask with cron_task.Task {
@@ -19,10 +21,13 @@ class TasksSeederTask with cron_task.Task {
       final now = DateTime.now();
       final weekFromNow = now.add(const Duration(days: 7));
 
-      final tasks = [
-        // App Internal Tasks
-        UserTaskModel(
-          title: 'Пройди 3 теста сегодня',
+      // Используем предопределенные UUID для каждой задачи
+      // Это позволяет избежать дубликатов при повторных запусках
+      final tasksWithIds = [
+        (
+          id: '00000000-0000-0000-0001-000000000001',
+          task: UserTaskModel(
+            title: 'Пройди 3 теста сегодня',
           description:
               'Заверши три тестовые сессии в приложении для улучшения навыков испанского.',
           type: 'app_internal',
@@ -36,9 +41,11 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow,
           tags: ['tests', 'practice', 'daily'],
         ),
-
-        UserTaskModel(
-          title: 'Достигни 80% правильных ответов в тесте',
+        ),
+        (
+          id: '00000000-0000-0000-0001-000000000002',
+          task: UserTaskModel(
+            title: 'Достигни 80% правильных ответов в тесте',
           description:
               'Пройди тест с результатом не менее 80% правильных ответов.',
           type: 'app_internal',
@@ -52,10 +59,12 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow,
           tags: ['tests', 'accuracy', 'challenge'],
         ),
-
+        ),
         // External Tasks
-        UserTaskModel(
-          title: 'Подпишись на Telegram канал',
+        (
+          id: '00000000-0000-0000-0001-000000000003',
+          task: UserTaskModel(
+            title: 'Подпишись на Telegram канал',
           description:
               'Подпишись на наш Telegram канал @mnemo_cards для получения обновлений и советов по изучению испанского.',
           type: 'external',
@@ -69,9 +78,11 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow,
           tags: ['telegram', 'social', 'subscription'],
         ),
-
-        UserTaskModel(
-          title: 'Закажи еду на испанском',
+        ),
+        (
+          id: '00000000-0000-0000-0001-000000000004',
+          task: UserTaskModel(
+            title: 'Закажи еду на испанском',
           description:
               'Сделай заказ в ресторане или кафе, используя испанский язык. Запиши процесс на видео для подтверждения.',
           type: 'external',
@@ -91,9 +102,11 @@ class TasksSeederTask with cron_task.Task {
               'Запиши видео, где ты делаешь заказ на испанском. Убедись, что официант понимает тебя.',
           tags: ['speaking', 'restaurant', 'video', 'real_world'],
         ),
-
-        UserTaskModel(
-          title: 'Посмотри испанский фильм с субтитрами',
+        ),
+        (
+          id: '00000000-0000-0000-0001-000000000005',
+          task: UserTaskModel(
+            title: 'Посмотри испанский фильм с субтитрами',
           description:
               'Посмотри испанский фильм или сериал с испанскими субтитрами в течение 30 минут.',
           type: 'external',
@@ -107,10 +120,12 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow,
           tags: ['listening', 'media', 'subtitles'],
         ),
-
+        ),
         // Social Tasks
-        UserTaskModel(
-          title: 'Поделись прогрессом в соцсетях',
+        (
+          id: '00000000-0000-0000-0001-000000000006',
+          task: UserTaskModel(
+            title: 'Поделись прогрессом в соцсетях',
           description:
               'Поделись своим прогрессом в изучении испанского в социальных сетях с хэштегом #MnemoCards.',
           type: 'social',
@@ -124,9 +139,11 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow,
           tags: ['social', 'sharing', 'progress'],
         ),
-
-        UserTaskModel(
-          title: 'Найди партнёра для практики',
+        ),
+        (
+          id: '00000000-0000-0000-0001-000000000007',
+          task: UserTaskModel(
+            title: 'Найди партнёра для практики',
           description:
               'Найди собеседника для практики испанского языка (друга, коллегу или через языковые приложения).',
           type: 'social',
@@ -140,10 +157,12 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow.add(const Duration(days: 7)), // 2 weeks
           tags: ['conversation', 'partner', 'practice'],
         ),
-
+        ),
         // Additional App Tasks
-        UserTaskModel(
-          title: 'Изучай слова ежедневно 7 дней подряд',
+        (
+          id: '00000000-0000-0000-0001-000000000008',
+          task: UserTaskModel(
+            title: 'Изучай слова ежедневно 7 дней подряд',
           description:
               'Учи новые слова в приложении каждый день в течение недели.',
           type: 'app_internal',
@@ -161,9 +180,11 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow.add(const Duration(days: 21)), // 4 weeks
           tags: ['vocabulary', 'daily', 'streak', 'consistency'],
         ),
-
-        UserTaskModel(
-          title: 'Пройди тест по грамматике',
+        ),
+        (
+          id: '00000000-0000-0000-0001-000000000009',
+          task: UserTaskModel(
+            title: 'Пройди тест по грамматике',
           description:
               'Заверши специализированный тест по грамматике испанского языка.',
           type: 'app_internal',
@@ -177,9 +198,11 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow,
           tags: ['grammar', 'tests', 'knowledge'],
         ),
-
-        UserTaskModel(
-          title: 'Практикуй произношение',
+        ),
+        (
+          id: '00000000-0000-0000-0001-000000000010',
+          task: UserTaskModel(
+            title: 'Практикуй произношение',
           description:
               'Заверши урок по произношению или запиши себя, читая текст на испанском.',
           type: 'app_internal',
@@ -193,24 +216,28 @@ class TasksSeederTask with cron_task.Task {
           expiresAt: weekFromNow,
           tags: ['pronunciation', 'speaking', 'practice'],
         ),
+        ),
       ];
 
       // Convert UserTaskModel to UserTasksCompanion and insert
-      // Используем InsertMode.insertOrIgnore для автоматического игнорирования дубликатов через ON CONFLICT
-      for (final taskModel in tasks) {
+      // PostgreSQL автоматически генерирует UUID через DEFAULT gen_random_uuid()
+      // Используем InsertMode.insertOrIgnore с предопределенными UUID для идемпотентности
+      for (final taskData in tasksWithIds) {
+        final taskModel = taskData.task;
         final rewardsJson = taskModel.rewards.map((r) => r.toJson()).toList();
         
         await _db.into(_db.userTasks).insert(
           UserTasksCompanion.insert(
+            id: Value(taskData.id), // Предопределенный UUID для идемпотентности seeder'а
             title: taskModel.title,
             description: taskModel.description,
             type: taskModel.type,
             difficulty: taskModel.difficulty,
             status: taskModel.status,
             rewards: Value(rewardsJson),
-            createdAt: Value(taskModel.createdAt),
-            expiresAt: taskModel.expiresAt,
-            completedAt: Value(taskModel.completedAt),
+            createdAt: Value(PgDateTime(taskModel.createdAt)),
+            expiresAt: PgDateTime(taskModel.expiresAt),
+            completedAt: Value(taskModel.completedAt?.let(PgDateTime.new)),
             proofUrl: Value(taskModel.proofUrl),
             instructions: Value(taskModel.instructions),
             tags: Value(taskModel.tags),
@@ -220,7 +247,7 @@ class TasksSeederTask with cron_task.Task {
         );
       }
 
-      print('Successfully seeded ${tasks.length} user tasks (duplicates ignored)');
+      print('Successfully seeded ${tasksWithIds.length} user tasks (duplicates ignored)');
     } catch (e) {
       print('Error seeding tasks: $e');
       rethrow;

mnemo_cards_backend/lib/database/daos/achievement_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/achievements.dart';
 
@@ -45,7 +46,7 @@ class AchievementDao extends DatabaseAccessor<AppDatabase> with _$AchievementDao
       ..where((ua) => ua.userId.equals(userId) & ua.achievementId.equals(achievementId))
     ).write(UserAchievementsCompanion(
       progress: Value(progress),
-      updatedAt: Value(DateTime.now()),
+      updatedAt: Value(PgDateTime(DateTime.now())),
     ));
     return count > 0;
   }

mnemo_cards_backend/lib/database/daos/discount_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/discounts.dart';
 import '../tables/users.dart';
@@ -18,7 +19,7 @@ class DiscountDao extends DatabaseAccessor<AppDatabase> with _$DiscountDaoMixin
   
   /// Получить все активные кампании
   Future<List<DiscountCampaign>> getActiveCampaigns() {
-    final now = DateTime.now();
+    final now = PgDateTime(DateTime.now());
     return (select(db.discountCampaigns)
       ..where((c) => c.status.equals('active'))
       ..where((c) => c.start.isSmallerOrEqualValue(now))
@@ -44,7 +45,7 @@ class DiscountDao extends DatabaseAccessor<AppDatabase> with _$DiscountDaoMixin
       ..where((c) => c.id.equals(campaignId))
     ).write(DiscountCampaignsCompanion(
       status: Value(status),
-      updatedAt: Value(DateTime.now()),
+      updatedAt: Value(PgDateTime(DateTime.now())),
     ));
   }
   
@@ -77,7 +78,7 @@ class DiscountDao extends DatabaseAccessor<AppDatabase> with _$DiscountDaoMixin
       ..where((c) => c.id.equals(campaignId))
     ).write(DiscountCampaignsCompanion(
       isDeleted: const Value(true),
-      updatedAt: Value(DateTime.now()),
+      updatedAt: Value(PgDateTime(DateTime.now())),
     ));
   }
   
@@ -171,7 +172,7 @@ class DiscountDao extends DatabaseAccessor<AppDatabase> with _$DiscountDaoMixin
     String? productType,
     String? productId,
   }) async {
-    final now = DateTime.now();
+    final now = PgDateTime(DateTime.now());
     final query = select(db.discountCampaigns)
       ..where((c) => c.status.equals('active'))
       ..where((c) => c.start.isSmallerOrEqualValue(now))

mnemo_cards_backend/lib/database/daos/pack_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/packs.dart';
 import '../tables/relations.dart';
@@ -60,7 +61,7 @@ class PackDao extends DatabaseAccessor<AppDatabase> with _$PackDaoMixin {
     if (packId == null) throw ArgumentError('Pack ID is required');
     
     return (update(cardPacks)..where((p) => p.id.equals(packId)))
-        .write(updates.copyWith(updatedAt: Value(DateTime.now())));
+        .write(updates.copyWith(updatedAt: Value(PgDateTime(DateTime.now()))));
   }
   
   /// Удалить пак (soft delete)
@@ -68,7 +69,7 @@ class PackDao extends DatabaseAccessor<AppDatabase> with _$PackDaoMixin {
     return (update(cardPacks)..where((p) => p.id.equals(packId)))
         .write(CardPacksCompanion(
           isDeleted: const Value(true),
-          updatedAt: Value(DateTime.now()),
+          updatedAt: Value(PgDateTime(DateTime.now())),
         ));
   }
   
@@ -137,7 +138,7 @@ class PackDao extends DatabaseAccessor<AppDatabase> with _$PackDaoMixin {
     return (update(gameCards)..where((c) => c.id.equals(cardId)))
         .write(GameCardsCompanion(
           isDeleted: const Value(true),
-          updatedAt: Value(DateTime.now()),
+          updatedAt: Value(PgDateTime(DateTime.now())),
         ));
   }
 

mnemo_cards_backend/lib/database/daos/payment_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/payments.dart';
 
@@ -56,7 +57,7 @@ class PaymentDao extends DatabaseAccessor<AppDatabase> with _$PaymentDaoMixin {
       'SELECT id FROM payments WHERE user_id = ? AND date = ? AND amount = ? ORDER BY created_at DESC LIMIT 1',
       variables: [
         Variable.withString(payment.userId.value),
-        Variable.withDateTime(inserted.date),
+        Variable.withDateTime(inserted.date.dateTime),
         Variable.withString(inserted.amount),
       ],
       readsFrom: {payments},
@@ -81,7 +82,7 @@ class PaymentDao extends DatabaseAccessor<AppDatabase> with _$PaymentDaoMixin {
     return (update(payments)..where((p) => p.id.equals(paymentId)))
         .write(PaymentsCompanion(
           status: Value(status),
-          updatedAt: Value(DateTime.now()),
+          updatedAt: Value(PgDateTime(DateTime.now())),
         ));
   }
   

mnemo_cards_backend/lib/database/daos/promo_code_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/promo_codes.dart';
 import '../tables/users.dart';
@@ -18,7 +19,7 @@ class PromoCodeDao extends DatabaseAccessor<AppDatabase> with _$PromoCodeDaoMixi
   
   /// Получить все активные кампании
   Future<List<PromoCodesCampaign>> getActiveCampaigns() {
-    final now = DateTime.now();
+    final now = PgDateTime(DateTime.now());
     return (select(db.promoCodesCampaigns)
       ..where((c) => c.status.equals('active'))
       ..where((c) => c.start.isSmallerOrEqualValue(now))
@@ -44,7 +45,7 @@ class PromoCodeDao extends DatabaseAccessor<AppDatabase> with _$PromoCodeDaoMixi
       ..where((c) => c.id.equals(campaignId))
     ).write(PromoCodesCampaignsCompanion(
       status: Value(status),
-      updatedAt: Value(DateTime.now()),
+      updatedAt: Value(PgDateTime(DateTime.now())),
     ));
   }
   
@@ -109,7 +110,7 @@ class PromoCodeDao extends DatabaseAccessor<AppDatabase> with _$PromoCodeDaoMixi
     if (code != null) {
       await update(db.promoCodes).replace(code.copyWith(
         activations: code.activations + 1,
-        updatedAt: DateTime.now(),
+        updatedAt: PgDateTime(DateTime.now()),
       ));
     }
   }

mnemo_cards_backend/lib/database/daos/statistics_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/statistics.dart';
 import '../tables/users.dart';
@@ -42,10 +43,10 @@ class StatisticsDao extends DatabaseAccessor<AppDatabase> with _$StatisticsDaoMi
       ..orderBy([(s) => OrderingTerm.desc(s.startTime)]);
     
     if (fromDate != null) {
-      query.where((s) => s.startTime.isBiggerOrEqualValue(fromDate));
+      query.where((s) => s.startTime.isBiggerOrEqualValue(PgDateTime(fromDate)));
     }
     if (toDate != null) {
-      query.where((s) => s.startTime.isSmallerOrEqualValue(toDate));
+      query.where((s) => s.startTime.isSmallerOrEqualValue(PgDateTime(toDate)));
     }
     
     if (limit != null) {
@@ -74,8 +75,8 @@ class StatisticsDao extends DatabaseAccessor<AppDatabase> with _$StatisticsDaoMi
   }) {
     final updates = StudySessionsCompanion(
       id: Value(sessionId),
-      endTime: Value(DateTime.now()),
-      updatedAt: Value(DateTime.now()),
+      endTime: Value(PgDateTime(DateTime.now())),
+      updatedAt: Value(PgDateTime(DateTime.now())),
       wordsLearned: wordsLearned != null ? Value(wordsLearned) : const Value.absent(),
       testsCompleted: testsCompleted != null ? Value(testsCompleted) : const Value.absent(),
       accuracy: accuracy != null ? Value(accuracy) : const Value.absent(),

mnemo_cards_backend/lib/database/daos/subscription_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/subscriptions.dart';
 import '../tables/users.dart';
@@ -46,7 +47,7 @@ class SubscriptionDao extends DatabaseAccessor<AppDatabase> with _$SubscriptionD
   
   /// Получить активную подписку пользователя
   Future<UserSubscription?> getActiveSubscription(String userId) async {
-    final now = DateTime.now();
+    final now = PgDateTime(DateTime.now());
     return (select(userSubscriptions)
       ..where((us) => us.userId.equals(userId))
       ..where((us) => us.start.isSmallerThanValue(now))
@@ -81,7 +82,7 @@ class SubscriptionDao extends DatabaseAccessor<AppDatabase> with _$SubscriptionD
   
   /// Получить всех пользователей с активными подписками
   Future<List<UserSubscription>> getActiveSubscriptions() async {
-    final now = DateTime.now();
+    final now = PgDateTime(DateTime.now());
     return (select(userSubscriptions)
       ..where((us) => us.start.isSmallerThanValue(now))
       ..where((us) => us.finish.isBiggerThanValue(now))
@@ -100,7 +101,7 @@ class SubscriptionDao extends DatabaseAccessor<AppDatabase> with _$SubscriptionD
     if (subscription != null) {
       await update(userSubscriptions).replace(
         subscription.copyWith(
-          finish: DateTime.now(),
+          finish: PgDateTime(DateTime.now()),
         ),
       );
     }

mnemo_cards_backend/lib/database/daos/task_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 
 part 'task_dao.g.dart';
@@ -32,10 +33,11 @@ class TaskDao extends DatabaseAccessor<AppDatabase> with _$TaskDaoMixin {
   
   /// Обновить время последнего выполнения
   Future<void> updateLastExecution(String taskId) {
+    final now = PgDateTime(DateTime.now());
     return (update(db.tasks)..where((t) => t.id.equals(taskId)))
         .write(TasksCompanion(
-          lastExecution: Value(DateTime.now()),
-          updatedAt: Value(DateTime.now()),
+          lastExecution: Value(now),
+          updatedAt: Value(now),
         ));
   }
   
@@ -66,7 +68,7 @@ class TaskDao extends DatabaseAccessor<AppDatabase> with _$TaskDaoMixin {
     }
     
     if (activeOnly) {
-      final now = DateTime.now();
+      final now = PgDateTime(DateTime.now());
       query.where((ut) => ut.expiresAt.isBiggerThanValue(now));
     }
     
@@ -88,11 +90,12 @@ class TaskDao extends DatabaseAccessor<AppDatabase> with _$TaskDaoMixin {
   
   /// Завершить задачу пользователя
   Future<void> completeUserTask(String taskId) {
+    final now = PgDateTime(DateTime.now());
     return (update(db.userTasks)..where((ut) => ut.id.equals(taskId)))
         .write(UserTasksCompanion(
           status: const Value('completed'),
-          completedAt: Value(DateTime.now()),
-          updatedAt: Value(DateTime.now()),
+          completedAt: Value(now),
+          updatedAt: Value(now),
         ));
   }
 

mnemo_cards_backend/lib/database/daos/test_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/tests.dart';
 import '../tables/packs.dart';
@@ -52,7 +53,7 @@ class TestDao extends DatabaseAccessor<AppDatabase> with _$TestDaoMixin {
     return (update(tests)..where((t) => t.id.equals(testId)))
         .write(TestsCompanion(
           isDeleted: const Value(true),
-          updatedAt: Value(DateTime.now()),
+          updatedAt: Value(PgDateTime(DateTime.now())),
         ));
   }
   

mnemo_cards_backend/lib/database/daos/user_dao.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../database.dart';
 import '../tables/users.dart';
 import '../tables/auth.dart';
@@ -82,7 +83,7 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
     return (update(users)..where((u) => u.id.equals(userId)))
         .write(UsersCompanion(
           isDeleted: const Value(true),
-          updatedAt: Value(DateTime.now()),
+          updatedAt: Value(PgDateTime(DateTime.now())),
         ));
   }
   
@@ -115,7 +116,7 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
   
   /// Получить пользователей с активной подпиской
   Stream<List<User>> watchUsersWithActiveSubscription() {
-    final now = DateTime.now();
+    final now = PgDateTime(DateTime.now());
     final query = select(users).join([
       innerJoin(
         db.userSubscriptions,
@@ -155,15 +156,16 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
     if (userId == null) throw ArgumentError('User ID is required');
     
     return (update(userDatas)..where((ud) => ud.userId.equals(userId)))
-        .write(updates.copyWith(updatedAt: Value(DateTime.now())));
+        .write(updates.copyWith(updatedAt: Value(PgDateTime(DateTime.now()))));
   }
   
   /// Обновить время последнего визита
   Future<void> updateLastOnline(String userId) async {
+    final now = PgDateTime(DateTime.now());
     await (update(userDatas)..where((ud) => ud.userId.equals(userId)))
         .write(UserDatasCompanion(
-          lastTimeOnline: Value(DateTime.now()),
-          updatedAt: Value(DateTime.now()),
+          lastTimeOnline: Value(now),
+          updatedAt: Value(now),
         ));
   }
   
@@ -188,7 +190,7 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
   Future<Token?> getTokenByUserId(String userId) {
     return (select(tokens)
       ..where((t) => t.userId.equals(userId))
-      ..where((t) => t.expires.isBiggerThanValue(DateTime.now()))
+      ..where((t) => t.expires.isBiggerThanValue(PgDateTime(DateTime.now())))
       ..orderBy([(t) => OrderingTerm.desc(t.created)])
     ).getSingleOrNull();
   }
@@ -212,7 +214,7 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
   /// Удалить истекшие токены
   Future<int> deleteExpiredTokens() {
     return (delete(tokens)
-      ..where((t) => t.expires.isSmallerThanValue(DateTime.now()))
+      ..where((t) => t.expires.isSmallerThanValue(PgDateTime(DateTime.now())))
     ).go();
   }
   
@@ -229,7 +231,7 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
     return (select(refreshTokens)
       ..where((rt) => rt.userId.equals(userId))
       ..where((rt) => rt.isBlacklisted.equals(false))
-      ..where((rt) => rt.expiresAt.isBiggerThanValue(DateTime.now()))
+      ..where((rt) => rt.expiresAt.isBiggerThanValue(PgDateTime(DateTime.now())))
       ..orderBy([(rt) => OrderingTerm.desc(rt.createdAt)])
     ).get();
   }
@@ -259,7 +261,7 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
   /// Удалить истекшие refresh токены
   Future<int> deleteExpiredRefreshTokens() {
     return (delete(refreshTokens)
-      ..where((rt) => rt.expiresAt.isSmallerThanValue(DateTime.now()))
+      ..where((rt) => rt.expiresAt.isSmallerThanValue(PgDateTime(DateTime.now())))
     ).go();
   }
   
@@ -282,14 +284,14 @@ class UserDao extends DatabaseAccessor<AppDatabase> with _$UserDaoMixin {
     return (update(db.telegramAuthCodes)..where((ac) => ac.code.equals(code)))
         .write(TelegramAuthCodesCompanion(
           isUsed: const Value(true),
-          usedAt: Value(DateTime.now()),
+          usedAt: Value(PgDateTime(DateTime.now())),
         ));
   }
   
   /// Удалить истекшие коды
   Future<int> deleteExpiredAuthCodes() {
     return (delete(db.telegramAuthCodes)
-      ..where((ac) => ac.expiresAt.isSmallerThanValue(DateTime.now()))
+      ..where((ac) => ac.expiresAt.isSmallerThanValue(PgDateTime(DateTime.now())))
     ).go();
   }
   

mnemo_cards_backend/lib/database/database.dart

@@ -32,7 +32,6 @@ import 'daos/promo_code_dao.dart';
 import 'daos/discount_dao.dart';
 import 'daos/statistics_dao.dart';
 import 'daos/achievement_dao.dart';
-import 'postgres_constants.dart';
 
 // Сгенерированный код будет здесь
 part 'database.g.dart';

mnemo_cards_backend/lib/database/postgres_constants.dart

@@ -1,6 +0,0 @@
-import 'package:drift/drift.dart';
-
-/// PostgreSQL-совместимое выражение для текущей даты и времени как Unix timestamp (bigint)
-/// Используется вместо currentDateAndTime, который использует SQLite-специфичную функцию strftime
-/// Drift хранит DateTime как bigint (Unix timestamp в секундах), поэтому используем EXTRACT(EPOCH FROM NOW())::BIGINT
-const Expression<DateTime> currentTimestamp = CustomExpression<DateTime>('EXTRACT(EPOCH FROM NOW())::BIGINT');

mnemo_cards_backend/lib/database/tables/achievements.dart

@@ -1,25 +1,31 @@
 import 'package:drift/drift.dart';
-import '../postgres_constants.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'users.dart';
 
 /// Таблица UserAchievements - достижения пользователей
 class UserAchievements extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
 
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
 
   // Achievement ID (from AchievementDefinitions)
   TextColumn get achievementId => text()();
 
   // When achievement was unlocked
-  DateTimeColumn get unlockedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get unlockedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
 
   // Progress (0.0 to 1.0)
   RealColumn get progress => real().withDefault(const Constant(1.0))();
 
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
 
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/auth.dart

@@ -1,18 +1,22 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'users.dart';
 import '../converters.dart' show generateUuid;
-import '../postgres_constants.dart';
 
 /// Таблица Tokens - токены авторизации пользователей
 class Tokens extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
   TextColumn get token => text().unique()();
   TextColumn get externalUserId => text()();
   
-  DateTimeColumn get created => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get expires => dateTime()();
+  Column<PgDateTime> get created => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get expires => customType(PgTypes.timestampWithTimezone)();
   
   @override
   Set<Column> get primaryKey => {id};
@@ -25,17 +29,21 @@ class Tokens extends Table {
 
 /// Таблица RefreshTokens - refresh токены для JWT
 class RefreshTokens extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
   TextColumn get jti => text().unique()();  // JWT ID
   
   BoolColumn get isBlacklisted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get expiresAt => dateTime()();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get expiresAt => customType(PgTypes.timestampWithTimezone)();
   
   @override
   Set<Column> get primaryKey => {id};
@@ -43,7 +51,9 @@ class RefreshTokens extends Table {
 
 /// Таблица TelegramAuthCodes - коды для авторизации через Telegram
 class TelegramAuthCodes extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   TextColumn get code => text().unique()();
   TextColumn get telegramUserId => text()();
@@ -53,11 +63,13 @@ class TelegramAuthCodes extends Table {
   
   BoolColumn get isUsed => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
-  DateTimeColumn get usedAt => dateTime().nullable()();
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+  Column<PgDateTime> get usedAt => customType(PgTypes.timestampWithTimezone)
+      .nullable()();
   
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get expiresAt => dateTime()();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get expiresAt => customType(PgTypes.timestampWithTimezone)();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/discounts.dart

@@ -1,16 +1,18 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart' show generateUuid, StringListConverter, JsonListConverter;
-import '../postgres_constants.dart';
 import 'users.dart';
 
 /// Таблица DiscountCampaigns - кампании скидок
 class DiscountCampaigns extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   TextColumn get name => text().nullable()();
   
-  DateTimeColumn get start => dateTime()();
-  DateTimeColumn get finish => dateTime()();
+  Column<PgDateTime> get start => customType(PgTypes.timestampWithTimezone)();
+  Column<PgDateTime> get finish => customType(PgTypes.timestampWithTimezone)();
   
   // Статус (enum as string)
   TextColumn get status => text()();  // created, active, expired, disabled
@@ -21,11 +23,13 @@ class DiscountCampaigns extends Table {
       .map(const StringListConverter())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -33,8 +37,11 @@ class DiscountCampaigns extends Table {
 
 /// Таблица Discounts - скидки
 class Discounts extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get campaignId => text().references(DiscountCampaigns, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get campaignId => text()
+      .references(DiscountCampaigns, #id, onDelete: KeyAction.cascade)();
   
   // Процент скидки (0-100)
   RealColumn get discountPercent => real()();
@@ -45,11 +52,13 @@ class Discounts extends Table {
       .map(const JsonListConverter())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -57,10 +66,13 @@ class Discounts extends Table {
 
 /// Junction table для связи Discounts ↔ UserDatas (many-to-many)
 class DiscountUserDatas extends Table {
-  TextColumn get discountId => text().references(Discounts, #id, onDelete: KeyAction.cascade)();
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  TextColumn get discountId => text()
+      .references(Discounts, #id, onDelete: KeyAction.cascade)();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
-  DateTimeColumn get grantedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get grantedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {discountId, userId};

mnemo_cards_backend/lib/database/tables/packs.dart

@@ -1,10 +1,12 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart' show generateUuid, IntListConverter, StringListConverter;
-import '../postgres_constants.dart';
 
 /// Таблица CardPacks - наборы карточек
 class CardPacks extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   // Основная информация
   TextColumn get title => text()();
@@ -21,7 +23,7 @@ class CardPacks extends Table {
   IntColumn get order => integer().withDefault(const Constant(0))();
   BoolColumn get enabled => boolean()
       .withDefault(const Constant(true))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   // Порядок карточек (JSON array of IDs)
   TextColumn get cardsOrder => text()
@@ -38,11 +40,13 @@ class CardPacks extends Table {
   TextColumn get currency => text().withDefault(const Constant('RUB'))();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -50,8 +54,11 @@ class CardPacks extends Table {
 
 /// Таблица GameCards - карточки для изучения
 class GameCards extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get packId => text().references(CardPacks, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get packId => text()
+      .references(CardPacks, #id, onDelete: KeyAction.cascade)();
 
   // Основной контент
   TextColumn get original => text()();  // слово на иностранном языке
@@ -70,11 +77,13 @@ class GameCards extends Table {
   TextColumn get back => text().nullable()();  // дополнительный текст
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -82,13 +91,17 @@ class GameCards extends Table {
 
 /// Таблица VoiceModels - голосовые файлы для карточек
 class VoiceModels extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get cardId => text().references(GameCards, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get cardId => text()
+      .references(GameCards, #id, onDelete: KeyAction.cascade)();
 
   TextColumn get voiceUrl => text()();  // URL аудиофайла
   TextColumn get language => text()();  // язык озвучки
 
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/payments.dart

@@ -1,12 +1,15 @@
 import 'package:drift/drift.dart';
-import '../converters.dart' show generateUuid, JsonListConverter, StringListConverter;
-import '../postgres_constants.dart';
+import 'package:drift_postgres/drift_postgres.dart';
+import '../converters.dart' show JsonListConverter, StringListConverter;
 import 'users.dart';
 
 /// Таблица Payments - платежи
 class Payments extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
   TextColumn get amount => text()();
   TextColumn get currency => text()();
@@ -18,7 +21,8 @@ class Payments extends Table {
   TextColumn get externalToken => text().nullable()();
   TextColumn get meta => text().nullable()();
   
-  DateTimeColumn get date => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get date => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   // Продукты (JSON array)
   TextColumn get products => text()
@@ -31,11 +35,13 @@ class Payments extends Table {
       .map(const StringListConverter())();
   BoolColumn get subscription => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/promo_codes.dart

@@ -1,11 +1,13 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart' show generateUuid, JsonListConverter, StringListConverter;
-import '../postgres_constants.dart';
 import 'users.dart';
 
 /// Таблица PromoCodesCampaigns - кампании промокодов
 class PromoCodesCampaigns extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   TextColumn get template => text()();
   TextColumn get name => text().nullable()();
@@ -19,8 +21,8 @@ class PromoCodesCampaigns extends Table {
   IntColumn get activationsPerUser => integer()();
   IntColumn get generationSize => integer()();
   
-  DateTimeColumn get start => dateTime()();
-  DateTimeColumn get finish => dateTime()();
+  Column<PgDateTime> get start => customType(PgTypes.timestampWithTimezone)();
+  Column<PgDateTime> get finish => customType(PgTypes.timestampWithTimezone)();
   
   // Статус (enum as string)
   TextColumn get status => text()();  // created, preparing, ready, active, disabled
@@ -31,11 +33,13 @@ class PromoCodesCampaigns extends Table {
       .map(const StringListConverter())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -43,18 +47,25 @@ class PromoCodesCampaigns extends Table {
 
 /// Таблица PromoCodes - промокоды
 class PromoCodes extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get campaignId => text().references(PromoCodesCampaigns, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get campaignId => text()
+      .references(PromoCodesCampaigns, #id, onDelete: KeyAction.cascade)();
   
   TextColumn get code => text().unique()();
   IntColumn get activations => integer().withDefault(const Constant(0))();
   
   // Индивидуальный промокод (связан с пользователем)
-  TextColumn get userId => text().nullable().references(Users, #id, onDelete: KeyAction.cascade)();
+  TextColumn get userId => text()
+      .nullable()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/relations.dart

@@ -1,16 +1,19 @@
 import 'package:drift/drift.dart';
-import '../postgres_constants.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'users.dart';
 import 'packs.dart' show CardPacks, GameCards, VoiceModels;
 
 /// Junction table для связи Users ↔ CardPacks (многие ко многим)
 /// Хранит информацию о том, какие паки куплены пользователем
 class UserPacks extends Table {
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
-  TextColumn get packId => text().references(CardPacks, #id, onDelete: KeyAction.cascade)();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
+  TextColumn get packId => text()
+      .references(CardPacks, #id, onDelete: KeyAction.cascade)();
   
   // Когда пользователь получил доступ к паку
-  DateTimeColumn get grantedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get grantedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   // Как пользователь получил пак (purchase, promo, free, admin)
   TextColumn get grantType => text().withDefault(const Constant('purchase'))();
@@ -22,8 +25,10 @@ class UserPacks extends Table {
 /// Таблица PreviewCards - связь CardPacks с preview карточками
 /// Хранит какие карточки показывать в превью пака
 class PreviewCards extends Table {
-  TextColumn get packId => text().references(CardPacks, #id, onDelete: KeyAction.cascade)();
-  TextColumn get cardId => text().references(GameCards, #id, onDelete: KeyAction.cascade)();
+  TextColumn get packId => text()
+      .references(CardPacks, #id, onDelete: KeyAction.cascade)();
+  TextColumn get cardId => text()
+      .references(GameCards, #id, onDelete: KeyAction.cascade)();
   
   IntColumn get order => integer().withDefault(const Constant(0))();
   
@@ -34,8 +39,10 @@ class PreviewCards extends Table {
 /// Таблица CardPackCards - связь CardPacks с GameCards (many-to-many)
 /// Хранит какие карточки принадлежат какому паку
 class CardPackCards extends Table {
-  TextColumn get packId => text().references(CardPacks, #id, onDelete: KeyAction.cascade)();
-  TextColumn get cardId => text().references(GameCards, #id, onDelete: KeyAction.cascade)();
+  TextColumn get packId => text()
+      .references(CardPacks, #id, onDelete: KeyAction.cascade)();
+  TextColumn get cardId => text()
+      .references(GameCards, #id, onDelete: KeyAction.cascade)();
   
   IntColumn get order => integer().withDefault(const Constant(0))();
   
@@ -46,8 +53,10 @@ class CardPackCards extends Table {
 /// Таблица CardVoices - связь GameCards с VoiceModels (many-to-many)
 /// Хранит какие голосовые файлы принадлежат какой карточке
 class CardVoices extends Table {
-  TextColumn get cardId => text().references(GameCards, #id, onDelete: KeyAction.cascade)();
-  TextColumn get voiceId => text().references(VoiceModels, #id, onDelete: KeyAction.cascade)();
+  TextColumn get cardId => text()
+      .references(GameCards, #id, onDelete: KeyAction.cascade)();
+  TextColumn get voiceId => text()
+      .references(VoiceModels, #id, onDelete: KeyAction.cascade)();
   
   @override
   Set<Column> get primaryKey => {cardId, voiceId};

mnemo_cards_backend/lib/database/tables/statistics.dart

@@ -1,17 +1,21 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'users.dart';
 import '../converters.dart' show generateUuid;
-import '../postgres_constants.dart';
 
 /// Таблица StudySessions - сессии изучения
 class StudySessions extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
   TextColumn get sessionId => text().nullable().unique()();
   
-  DateTimeColumn get startTime => dateTime()();
-  DateTimeColumn get endTime => dateTime().nullable()();
+  Column<PgDateTime> get startTime => customType(PgTypes.timestampWithTimezone)();
+  Column<PgDateTime> get endTime => customType(PgTypes.timestampWithTimezone)
+      .nullable()();
   
   IntColumn get wordsLearned => integer().withDefault(const Constant(0))();
   IntColumn get testsCompleted => integer().withDefault(const Constant(0))();
@@ -21,8 +25,10 @@ class StudySessions extends Table {
   TextColumn get testId => text().nullable()();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/subscriptions.dart

@@ -1,12 +1,13 @@
 import 'package:drift/drift.dart';
-
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart' show JsonMapConverter, JsonListConverter;
-import '../postgres_constants.dart';
 import 'users.dart';
 
 /// Таблица SubscriptionPlans - планы подписки
 class SubscriptionPlans extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   // UI информация (JSON)
   TextColumn get ui => text().nullable().map(const JsonMapConverter())();
@@ -26,11 +27,13 @@ class SubscriptionPlans extends Table {
   TextColumn get paymentSystem => text()();  // enum as string
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -38,11 +41,15 @@ class SubscriptionPlans extends Table {
 
 /// Таблица UserSubscriptions - подписки пользователей
 class UserSubscriptions extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().unique().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .unique()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
-  DateTimeColumn get start => dateTime()();
-  DateTimeColumn get finish => dateTime()();
+  Column<PgDateTime> get start => customType(PgTypes.timestampWithTimezone)();
+  Column<PgDateTime> get finish => customType(PgTypes.timestampWithTimezone)();
   
   // Функции подписки (JSON array)
   TextColumn get features => text()
@@ -50,8 +57,10 @@ class UserSubscriptions extends Table {
       .map(const JsonListConverter())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/tasks.dart

@@ -1,11 +1,13 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart' show generateUuid, JsonListConverter, JsonMapConverter, StringListConverter;
-import '../postgres_constants.dart';
 import 'users.dart';
 
 /// Таблица Tasks - задачи системы
 class Tasks extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   TextColumn get name => text()();
   IntColumn get minCycleMillis => integer()();
@@ -15,11 +17,14 @@ class Tasks extends Table {
   
   TextColumn get status => text().nullable()();
   TextColumn get description => text().nullable()();
-  DateTimeColumn get lastExecution => dateTime().nullable()();
+  Column<PgDateTime> get lastExecution => customType(PgTypes.timestampWithTimezone)
+      .nullable()();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};
@@ -27,7 +32,9 @@ class Tasks extends Table {
 
 /// Таблица UserTasks - задачи пользователей
 class UserTasks extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   TextColumn get title => text()();
   TextColumn get description => text()();
@@ -40,9 +47,11 @@ class UserTasks extends Table {
       .withDefault(const Constant('[]'))
       .map(const JsonListConverter())();
   
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get expiresAt => dateTime()();
-  DateTimeColumn get completedAt => dateTime().nullable()();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get expiresAt => customType(PgTypes.timestampWithTimezone)();
+  Column<PgDateTime> get completedAt => customType(PgTypes.timestampWithTimezone)
+      .nullable()();
   
   TextColumn get proofUrl => text().nullable()();
   TextColumn get instructions => text().nullable()();
@@ -55,7 +64,8 @@ class UserTasks extends Table {
   TextColumn get imageUrl => text().nullable()();
   
   // Audit
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};
@@ -63,8 +73,11 @@ class UserTasks extends Table {
 
 /// Таблица UserTaskProgresses - прогресс выполнения задач пользователями
 class UserTaskProgresses extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   TextColumn get taskId => text()();  // Reference to UserTasks, but not FK to avoid circular deps
 
   // Прогресс (JSON)
@@ -72,8 +85,10 @@ class UserTaskProgresses extends Table {
       .withDefault(const Constant('{}'))
       .map(const JsonMapConverter())();
 
-  DateTimeColumn get startedAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get startedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};
@@ -81,8 +96,11 @@ class UserTaskProgresses extends Table {
 
 /// Таблица UserTaskResults - результаты выполнения задач
 class UserTaskResults extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   TextColumn get taskId => text()();  // Reference to UserTasks
   
   // Результаты (JSON)
@@ -90,10 +108,12 @@ class UserTaskResults extends Table {
       .withDefault(const Constant('{}'))
       .map(const JsonMapConverter())();
   
-  DateTimeColumn get completedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get completedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/telegram.dart

@@ -1,21 +1,27 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart' show generateUuid;
-import '../postgres_constants.dart';
 
 /// Таблица ShareRequests - запросы на шаринг через Telegram
 class ShareRequests extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   TextColumn get telegramUserId => text()();
   TextColumn get telegramUsername => text().nullable()();
   
-  TextColumn get sharedCardId => text().nullable()();
+  TextColumn get sharedCardId => text()
+      .nullable()();
   
-  DateTimeColumn get requestedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get requestedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/tests.dart

@@ -1,11 +1,13 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart' show generateUuid, JsonMapConverter;
-import '../postgres_constants.dart';
 import 'packs.dart';
 
 /// Таблица Tests - тесты
 class Tests extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   
   TextColumn get name => text()();
   TextColumn get color => text().nullable()();
@@ -15,11 +17,13 @@ class Tests extends Table {
   TextColumn get timeSubtitle => text().nullable()();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -27,16 +31,21 @@ class Tests extends Table {
 
 /// Таблица TestQuestions - вопросы тестов
 class TestQuestions extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get testId => text().references(Tests, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get testId => text()
+      .references(Tests, #id, onDelete: KeyAction.cascade)();
   
   // Тип вопроса (enum as string)
   TextColumn get questionType => text()();
   TextColumn get body => text()();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};
@@ -44,8 +53,10 @@ class TestQuestions extends Table {
 
 /// Таблица TestPackRelations - связь Tests с CardPacks (many-to-many)
 class TestPackRelations extends Table {
-  TextColumn get testId => text().references(Tests, #id, onDelete: KeyAction.cascade)();
-  TextColumn get packId => text().references(CardPacks, #id, onDelete: KeyAction.cascade)();
+  TextColumn get testId => text()
+      .references(Tests, #id, onDelete: KeyAction.cascade)();
+  TextColumn get packId => text()
+      .references(CardPacks, #id, onDelete: KeyAction.cascade)();
   
   @override
   Set<Column> get primaryKey => {testId, packId};
@@ -53,20 +64,26 @@ class TestPackRelations extends Table {
 
 /// Таблица TestStatistics - статистика прохождения тестов
 class TestStatistics extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   TextColumn get userId => text()();  // Reference to Users, but not FK to avoid circular deps
-  TextColumn get testId => text().references(Tests, #id, onDelete: KeyAction.cascade)();
+  TextColumn get testId => text()
+      .references(Tests, #id, onDelete: KeyAction.cascade)();
   
   // Результаты (JSON)
   TextColumn get results => text()
       .withDefault(const Constant('{}'))
       .map(const JsonMapConverter())();
   
-  DateTimeColumn get completedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get completedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/database/tables/users.dart

@@ -1,16 +1,18 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import '../converters.dart';
-import '../postgres_constants.dart';
 
 /// Таблица Users - основная информация о пользователях
 class Users extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
   TextColumn get externalUserId => text().unique()();
   TextColumn get name => text().nullable()();
   TextColumn get email => text().nullable()();
   BoolColumn get admin => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   // UserSettings (JSON)
   TextColumn get userSettings => text().nullable()();
@@ -21,11 +23,13 @@ class Users extends Table {
       .map(const StringListConverter())();
   
   // Audit fields
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   BoolColumn get isDeleted => boolean()
       .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN, не нужен CHECK
+      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -38,8 +42,12 @@ class Users extends Table {
 
 /// Таблица UserDatas - расширенная информация о пользователе
 class UserDatas extends Table {
-  TextColumn get id => text().withDefault(const Constant('gen_random_uuid()'))();
-  TextColumn get userId => text().unique().references(Users, #id, onDelete: KeyAction.cascade)();
+  // ID как String, но фактически UUID (генерируется PostgreSQL на стороне БД)
+  TextColumn get id => text()
+      .withDefault(const CustomExpression('gen_random_uuid()::text'))();
+  TextColumn get userId => text()
+      .unique()
+      .references(Users, #id, onDelete: KeyAction.cascade)();
   
   // Статистика
   IntColumn get totalStudyTimeMinutes => integer().withDefault(const Constant(0))();
@@ -49,8 +57,10 @@ class UserDatas extends Table {
   IntColumn get totalTests => integer().withDefault(const Constant(0))();
   
   // Временные метки
-  DateTimeColumn get lastTimeOnline => dateTime().nullable()();
-  DateTimeColumn get registrationDate => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get lastTimeOnline => customType(PgTypes.timestampWithTimezone)
+      .nullable()();
+  Column<PgDateTime> get registrationDate => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   TextColumn get lastTestSessionToken => text().nullable()();
   
   // Сложные структуры (JSON)
@@ -79,8 +89,10 @@ class UserDatas extends Table {
       .map(const JsonMapConverter())();
   
   // Audit
-  DateTimeColumn get createdAt => dateTime().withDefault(currentTimestamp)();
-  DateTimeColumn get updatedAt => dateTime().withDefault(currentTimestamp)();
+  Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
+  Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
+      .withDefault(now())();
   
   @override
   Set<Column> get primaryKey => {id};

mnemo_cards_backend/lib/discounts/discount_drift_extension.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart' as drift;
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:mnemo_cards_backend/database/daos/discount_dao.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 import 'package:mnemo_cards_common/mnemo_cards_common.dart';
@@ -30,8 +31,8 @@ extension DiscountCampaignToDto on DiscountCampaign {
     
     return DiscountCampaignDto(
       id: id,
-      start: start,
-      finish: finish,
+      start: start.dateTime,
+      finish: finish.dateTime,
       status: statusEnum,
       name: name,
       tags: tags,
@@ -80,8 +81,8 @@ extension DiscountCampaignDtoToCompanion on DiscountCampaignDto {
     return DiscountCampaignsCompanion.insert(
       id: id != null ? drift.Value(id!) : const drift.Value.absent(),
       name: drift.Value(name),
-      start: start,
-      finish: finish,
+      start: PgDateTime(start),
+      finish: PgDateTime(finish),
       status: statusStr,
       tags: drift.Value(tags),
     );

mnemo_cards_backend/lib/discounts/discounts_manager.dart

@@ -42,12 +42,12 @@ class DiscountsManager {
     String? targetStatus;
     
     if (campaign.status == 'created' &&
-        now.isBetween(campaign.start, campaign.finish)) {
+        now.isBetween(campaign.start.dateTime, campaign.finish.dateTime)) {
       targetStatus = 'active';
     } else if (campaign.status == 'active') {
-      if (now.isBefore(campaign.start)) {
+      if (now.isBefore(campaign.start.dateTime)) {
         targetStatus = 'created';
-      } else if (now.isAfter(campaign.finish)) {
+      } else if (now.isAfter(campaign.finish.dateTime)) {
         targetStatus = 'expired';
       }
     }
@@ -59,8 +59,8 @@ class DiscountsManager {
 
   Future<DiscountError?> applyCampaign(DiscountCampaign campaign) async {
     final now = DateTime.now();
-    if (!now.isBetween(campaign.start, campaign.finish)) {
-      if (now.isBefore(campaign.start)) {
+    if (!now.isBetween(campaign.start.dateTime, campaign.finish.dateTime)) {
+      if (now.isBefore(campaign.start.dateTime)) {
         return DiscountError(DiscountErrorType.notStarted);
       }
       return DiscountError(DiscountErrorType.expired);

mnemo_cards_backend/lib/promo_codes/promo_codes_manager.dart

@@ -1,3 +1,4 @@
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/api/purchase/payment_manager.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
@@ -47,8 +48,8 @@ class PromoCodesManager {
         activationsPerCode: campaign.activationsPerCode,
         activationsPerUser: campaign.activationsPerUser,
         generationSize: campaign.generationSize,
-        start: campaign.start,
-        finish: campaign.finish,
+        start: campaign.start.dateTime,
+        finish: campaign.finish.dateTime,
         status: _parseCampaignStatus(campaign.status),
         tags: campaign.tags,
         promoCodes: promoCodes,
@@ -77,8 +78,8 @@ class PromoCodesManager {
       activationsPerCode: campaign.activationsPerCode,
       activationsPerUser: campaign.activationsPerUser,
       generationSize: campaign.generationSize,
-      start: campaign.start,
-      finish: campaign.finish,
+      start: campaign.start.dateTime,
+      finish: campaign.finish.dateTime,
       status: _parseCampaignStatus(campaign.status),
       tags: campaign.tags,
       promoCodes: promoCodes,
@@ -95,8 +96,8 @@ class PromoCodesManager {
       activationsPerCode: dto.activationsPerCode,
       activationsPerUser: dto.activationsPerUser,
       generationSize: dto.generationSize,
-      start: dto.start,
-      finish: dto.finish,
+      start: PgDateTime(dto.start),
+      finish: PgDateTime(dto.finish),
       status: dto.status.name,
       tags: drift.Value(dto.tags),
     );
@@ -119,11 +120,11 @@ class PromoCodesManager {
       activationsPerCode: dto.activationsPerCode,
       activationsPerUser: dto.activationsPerUser,
       generationSize: dto.generationSize,
-      start: dto.start,
-      finish: dto.finish,
+      start: PgDateTime(dto.start),
+      finish: PgDateTime(dto.finish),
       status: dto.status.name,
       tags: dto.tags,
-      updatedAt: DateTime.now(),
+      updatedAt: PgDateTime(DateTime.now()),
     );
 
     await _db.promoCodeDao.updateCampaign(updated);
@@ -137,7 +138,7 @@ class PromoCodesManager {
     // Soft delete - mark as deleted
     await _db.promoCodeDao.updateCampaign(existing.copyWith(
       isDeleted: true,
-      updatedAt: DateTime.now(),
+      updatedAt: PgDateTime(DateTime.now()),
     ));
 
     return null; // No error
@@ -168,8 +169,8 @@ class PromoCodesManager {
 
     final now = DateTime.now();
     if (campaign.status != 'active' ||
-        campaign.start.isAfter(now) ||
-        campaign.finish.isBefore(now)) {
+        campaign.start.dateTime.isAfter(now) ||
+        campaign.finish.dateTime.isBefore(now)) {
       return {'valid': false, 'message': 'Promo code expired'};
     }
 
@@ -254,7 +255,7 @@ class PromoCodesManager {
       await _db.promoCodeDao.updateCampaign(
         campaign.copyWith(
           status: 'active',
-          updatedAt: DateTime.now(),
+          updatedAt: PgDateTime(DateTime.now()),
         ),
       );
     });

mnemo_cards_backend/lib/statistics/achievement_manager.dart

@@ -1,4 +1,5 @@
 import 'package:drift/drift.dart';
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 import 'package:mnemo_cards_common/mnemo_cards_common.dart';
@@ -57,7 +58,7 @@ class AchievementManager {
       final definition = AchievementDefinitions.getById(userAchievement.achievementId);
       if (definition != null) {
         achievements.add(definition.copyWith(
-          unlockedAt: userAchievement.unlockedAt,
+          unlockedAt: userAchievement.unlockedAt.dateTime,
           progress: userAchievement.progress,
         ));
       }
@@ -90,7 +91,7 @@ class AchievementManager {
     final companion = UserAchievementsCompanion.insert(
       userId: userId,
       achievementId: achievementId,
-      unlockedAt: Value(DateTime.now()),
+      unlockedAt: Value(PgDateTime(DateTime.now())),
       progress: Value(1.0),
     );
 

mnemo_cards_backend/lib/statistics/session_tracker.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:collection';
 import 'dart:math';
 
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:mnemo_cards_backend/database/database.dart';
 import 'package:drift/drift.dart' as drift;
@@ -45,7 +46,7 @@ class SessionTracker {
 
     // Create new session
     final sessionId = _generateSessionId();
-    final now = DateTime.now();
+    final now = PgDateTime(DateTime.now());
 
     await _db.statisticsDao.createSession(
       StudySessionsCompanion.insert(
@@ -116,7 +117,7 @@ class SessionTracker {
       wordsLearned: wordsLearned ?? session.wordsLearned,
       testsCompleted: testsCompleted ?? session.testsCompleted,
       accuracy: accuracy ?? session.accuracy,
-      updatedAt: DateTime.now(),
+      updatedAt: PgDateTime(DateTime.now()),
     );
 
     await _db.statisticsDao.updateSession(updatedSession);
@@ -155,7 +156,7 @@ class SessionTracker {
 
       if (session != null &&
           session.endTime == null &&
-          now.difference(session.startTime).inMinutes > _sessionTimeout.inMinutes) {
+          now.difference(session.startTime.dateTime).inMinutes > _sessionTimeout.inMinutes) {
         expiredSessions.add(sessionId);
       }
     }
@@ -190,7 +191,7 @@ class SessionTracker {
     final session = await _db.statisticsDao.getSessionBySessionId(sessionId);
     if (session != null) {
       await _db.statisticsDao.updateSession(
-        session.copyWith(updatedAt: DateTime.now()),
+        session.copyWith(updatedAt: PgDateTime(DateTime.now())),
       );
     }
   }

mnemo_cards_backend/lib/tasks/task_manager.dart

@@ -1,3 +1,4 @@
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:drift/drift.dart' as drift;
 import 'package:mnemo_cards_backend/database/database.dart';
@@ -64,7 +65,7 @@ class TaskManager {
       }
 
       // Обновить статус задачи
-      final now = DateTime.now();
+      final now = PgDateTime(DateTime.now());
       await _db.taskDao.updateUserTask(
         task.copyWith(
           status: 'completed',
@@ -77,7 +78,7 @@ class TaskManager {
         UserTaskResultsCompanion.insert(
           userId: userId,
           taskId: taskId,
-          results: drift.Value({'completed': true, 'completedAt': now.toIso8601String()}),
+          results: drift.Value({'completed': true, 'completedAt': now.dateTime.toIso8601String()}),
         ),
       );
     });

mnemo_cards_backend/lib/user/user_manager.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'dart:developer';
 import 'dart:math' as math;
 
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:drift/drift.dart' as drift;
 import 'package:mnemo_cards_backend/database/database.dart';
@@ -48,7 +49,7 @@ class UserManager {
     final now = DateTime.now();
     final token = await _db.userDao.getTokenByUserId(user.id!);
     if (token != null) {
-      if (token.expires.isAfter(now)) {
+      if (token.expires.dateTime.isAfter(now)) {
         return token.token;
       }
       await _db.userDao.deleteToken(token.id);
@@ -59,7 +60,7 @@ class UserManager {
         token: userToken,
         externalUserId: externalId,
         userId: user.id!,
-        expires: now.add(const Duration(days: 360)),
+        expires: PgDateTime(now.add(const Duration(days: 360))),
       ),
     );
     return userToken;
@@ -71,7 +72,7 @@ class UserManager {
       return null;
     }
     final now = DateTime.now();
-    if (token.expires.isBefore(now)) {
+    if (token.expires.dateTime.isBefore(now)) {
       await _db.userDao.deleteToken(token.id);
       return null;
     }
@@ -98,8 +99,8 @@ class UserManager {
         await _db.userDao.updateUserDataPartial(
           UserDatasCompanion(
             userId: drift.Value(userId),
-            lastTimeOnline: drift.Value(lastOnline),
-            updatedAt: drift.Value(DateTime.now()),
+            lastTimeOnline: drift.Value(PgDateTime(lastOnline)),
+            updatedAt: drift.Value(PgDateTime(DateTime.now())),
           ),
         );
       }
@@ -137,7 +138,7 @@ class UserManager {
     await _db.userDao.createUserData(
       UserDatasCompanion.insert(
         userId: userId,
-        registrationDate: drift.Value(DateTime.now()),
+        registrationDate: drift.Value(PgDateTime(DateTime.now())),
       ),
     );
 
@@ -166,7 +167,7 @@ class UserManager {
       UsersCompanion(
         id: drift.Value(user.id!),
         userSettings: drift.Value(jsonEncode(settings.toJson())),
-        updatedAt: drift.Value(DateTime.now()),
+        updatedAt: drift.Value(PgDateTime(DateTime.now())),
       ),
     );
   }
@@ -219,7 +220,7 @@ class UserManager {
       // Обновить существующую статистику
       final updatedStat = existingStat.copyWith(
         results: drift.Value(updatedResults),
-        updatedAt: DateTime.now(),
+        updatedAt: PgDateTime(DateTime.now()),
       );
       await _db.testDao.updateTestStatistics(updatedStat);
     } else {
@@ -229,7 +230,7 @@ class UserManager {
           userId: user.id!,
           testId: testStat.testId,
           results: drift.Value(updatedResults),
-          completedAt: drift.Value(DateTime.now()),
+          completedAt: drift.Value(PgDateTime(DateTime.now())),
         ),
       );
     }
@@ -259,8 +260,8 @@ class UserManager {
         studyDates: drift.Value(studyDates),
         currentStreak: drift.Value(currentStreak),
         longestStreak: drift.Value(longestStreak),
-        lastTimeOnline: drift.Value(now),
-        updatedAt: drift.Value(now),
+        lastTimeOnline: drift.Value(PgDateTime(now)),
+        updatedAt: drift.Value(PgDateTime(now)),
       ),
     );
   }

mnemo_cards_backend/lib/user/user_manager_drift.dart

@@ -1,3 +1,4 @@
+import 'package:drift_postgres/drift_postgres.dart';
 import 'package:injectable/injectable.dart';
 import 'package:drift/drift.dart' as drift;
 import 'package:mnemo_cards_backend/database/database.dart';
@@ -44,7 +45,7 @@ class UserManager {
     final now = DateTime.now();
     final token = await _db.userDao.getTokenByUserId(user.id!);
     if (token != null) {
-      if (token.expires.isAfter(now)) {
+      if (token.expires.dateTime.isAfter(now)) {
         return token.token;
       }
       await _db.userDao.deleteToken(token.id);
@@ -55,7 +56,7 @@ class UserManager {
         token: userToken,
         externalUserId: externalId,
         userId: user.id!,
-        expires: now.add(const Duration(days: 360)),
+        expires: PgDateTime(now.add(const Duration(days: 360))),
       ),
     );
     return userToken;
@@ -67,7 +68,7 @@ class UserManager {
       return null;
     }
     final now = DateTime.now();
-    if (token.expires.isBefore(now)) {
+    if (token.expires.dateTime.isBefore(now)) {
       await _db.userDao.deleteToken(token.id);
       return null;
     }
@@ -94,8 +95,8 @@ class UserManager {
         await _db.userDao.updateUserDataPartial(
           UserDatasCompanion(
             userId: drift.Value(userId),
-            lastTimeOnline: drift.Value(lastOnline),
-            updatedAt: drift.Value(DateTime.now()),
+            lastTimeOnline: drift.Value(PgDateTime(lastOnline)),
+            updatedAt: drift.Value(PgDateTime(DateTime.now())),
           ),
         );
       }
@@ -133,7 +134,7 @@ class UserManager {
     await _db.userDao.createUserData(
       UserDatasCompanion.insert(
         userId: userId,
-        registrationDate: drift.Value(DateTime.now()),
+        registrationDate: drift.Value(PgDateTime(DateTime.now())),
       ),
     );
 

mnemo_cards_backend/pubspec.lock

@@ -53,10 +53,10 @@ packages:
     dependency: "direct main"
     description:
       name: async
-      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
       url: "https://pub.dev"
     source: hosted
-    version: "2.11.0"
+    version: "2.13.0"
   auth_header:
     dependency: transitive
     description:
@@ -229,10 +229,10 @@ packages:
     dependency: "direct main"
     description:
       name: crypto
-      sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
+      sha256: c8ea0233063ba03258fbcf2ca4d6dadfefe14f02fab57702265467a19f27fadf
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.3"
+    version: "3.0.7"
   dart_style:
     dependency: transitive
     description:
@@ -595,10 +595,10 @@ packages:
     dependency: "direct main"
     description:
       name: postgres
-      sha256: "83ba7afb0e778cc1f373e514c6110d323b81dfbaced774d3a7f4a0e21536eb45"
+      sha256: fefbbfe749c6130e5096588b9c4459173684c695952cd7636ab19be76f255469
       url: "https://pub.dev"
     source: hosted
-    version: "3.4.8"
+    version: "3.5.9"
   pub_semver:
     dependency: transitive
     description:
@@ -639,22 +639,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.2"
-  sasl_scram:
-    dependency: transitive
-    description:
-      name: sasl_scram
-      sha256: a47207a436eb650f8fdcf54a2e2587b850dc3caef9973ce01f332b07a6fc9cb9
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.1.1"
-  saslprep:
-    dependency: transitive
-    description:
-      name: saslprep
-      sha256: "3d421d10be9513bf4459c17c5e70e7b8bc718c9fc5ad4ba5eb4f5fd27396f740"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.3"
   shelf:
     dependency: "direct main"
     description:
@@ -827,18 +811,18 @@ packages:
     dependency: transitive
     description:
       name: stack_trace
-      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
+      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.1"
+    version: "1.12.1"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
-      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
+      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.2"
+    version: "2.1.4"
   stream_transform:
     dependency: transitive
     description:
@@ -895,14 +879,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.2"
-  unorm_dart:
-    dependency: transitive
-    description:
-      name: unorm_dart
-      sha256: "0c69186b03ca6addab0774bcc0f4f17b88d4ce78d9d4d8f0619e30a99ead58e7"
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.3.2"
   uuid:
     dependency: "direct main"
     description:

mnemo_cards_backend/pubspec.yaml

@@ -19,9 +19,9 @@ dependencies:
     path: ../mnemo_cards_common_backend
 
   # PostgreSQL + Drift
-  drift: ^2.14.0
-  drift_postgres: ^1.1.0
-  postgres: ^3.0.4
+  drift: ^2.30.0
+  drift_postgres: ^1.3.1
+  postgres: ^3.5.9
 
   image: ^4.1.7
   http: ^1.1.0
@@ -61,7 +61,7 @@ dev_dependencies:
   copy_with_extension_gen: ^11.0.0
   
   # Drift code generation
-  drift_dev: ^2.14.0
+  drift_dev: ^2.30.0
   
   shelf_router_generator: ^1.1.3
   shelf_open_api_generator: