diff --git a/mnemo_cards_backend/lib/database/daos/mixins/soft_delete_mixin.dart b/mnemo_cards_backend/lib/database/daos/mixins/soft_delete_mixin.dart
index fff5c3b..eb7f94b 100644
--- a/mnemo_cards_backend/lib/database/daos/mixins/soft_delete_mixin.dart
+++ b/mnemo_cards_backend/lib/database/daos/mixins/soft_delete_mixin.dart
@@ -35,15 +35,10 @@ mixin SoftDeleteMixin<T extends Table, D> on DatabaseAccessor<AppDatabase> {
   SimpleSelectStatement<T, D> selectActive() {
     return select(table)
       ..where((t) {
-        // Проблема: через dynamic Drift может неправильно определить тип boolean
-        // и сгенерировать SQL, который сравнивает boolean с integer
-        // Решение: используем прямое SQL выражение для правильного сравнения boolean
-        // В PostgreSQL имена колонок в snake_case: is_deleted
-        final tableName = table.actualTableName;
-        return CustomExpression<bool>(
-          '"$tableName"."is_deleted" = FALSE',
-          precedence: Precedence.comparison,
-        );
+        // После удаления customConstraint('') из boolean колонок,
+        // Drift корректно определяет тип boolean и генерирует правильный SQL
+        final isDeletedColumn = (t as dynamic).isDeleted;
+        return isDeletedColumn.equals(false);
       });
   }
   
diff --git a/mnemo_cards_backend/lib/database/database.g.dart b/mnemo_cards_backend/lib/database/database.g.dart
index fed8c95..69d9914 100644
--- a/mnemo_cards_backend/lib/database/database.g.dart
+++ b/mnemo_cards_backend/lib/database/database.g.dart
@@ -56,7 +56,9 @@ class $UsersTable extends Users with TableInfo<$UsersTable, User> {
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("admin" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _userSettingsMeta = const VerificationMeta(
@@ -116,7 +118,9 @@ class $UsersTable extends Users with TableInfo<$UsersTable, User> {
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   @override
@@ -1520,7 +1524,9 @@ class $TokensTable extends Tokens with TableInfo<$TokensTable, Token> {
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -2018,7 +2024,9 @@ class $RefreshTokensTable extends RefreshTokens
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_blacklisted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _createdAtMeta = const VerificationMeta(
@@ -2056,7 +2064,9 @@ class $RefreshTokensTable extends RefreshTokens
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -2628,7 +2638,9 @@ class $TelegramAuthCodesTable extends TelegramAuthCodes
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -3346,7 +3358,9 @@ class $CardPacksTable extends CardPacks
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("enabled" IN (0, 1))',
+    ),
     defaultValue: const Constant(true),
   );
   @override
@@ -3449,7 +3463,9 @@ class $CardPacksTable extends CardPacks
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   @override
@@ -4431,7 +4447,9 @@ class $GameCardsTable extends GameCards
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   @override
@@ -6584,7 +6602,9 @@ class $SubscriptionPlansTable extends SubscriptionPlans
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   @override
@@ -7748,7 +7768,9 @@ class $PaymentsTable extends Payments with TableInfo<$PaymentsTable, Payment> {
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -8535,7 +8557,9 @@ class $TestsTable extends Tests with TableInfo<$TestsTable, Test> {
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -9180,7 +9204,9 @@ class $TestQuestionsTable extends TestQuestions
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -12927,7 +12953,9 @@ class $PromoCodesCampaignsTable extends PromoCodesCampaigns
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -13754,7 +13782,9 @@ class $PromoCodesTable extends PromoCodes
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -14336,7 +14366,9 @@ class $DiscountCampaignsTable extends DiscountCampaigns
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -14947,7 +14979,9 @@ class $DiscountsTable extends Discounts
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
@@ -15832,7 +15866,9 @@ class $StudySessionsTable extends StudySessions
     false,
     type: DriftSqlType.bool,
     requiredDuringInsert: false,
-    $customConstraints: '',
+    defaultConstraints: GeneratedColumn.constraintIsAlways(
+      'CHECK ("is_deleted" IN (0, 1))',
+    ),
     defaultValue: const Constant(false),
   );
   static const VerificationMeta _deletedAtMeta = const VerificationMeta(
diff --git a/mnemo_cards_backend/lib/database/tables/auth.dart b/mnemo_cards_backend/lib/database/tables/auth.dart
index 13edc74..0a1b64c 100644
--- a/mnemo_cards_backend/lib/database/tables/auth.dart
+++ b/mnemo_cards_backend/lib/database/tables/auth.dart
@@ -18,8 +18,7 @@ class Tokens extends Table {
       .withDefault(now())();
   Column<PgDateTime> get expires => customType(PgTypes.timestampWithTimezone)();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')();
+      .withDefault(const Constant(false))();
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
@@ -43,15 +42,13 @@ class RefreshTokens extends Table {
   TextColumn get jti => text().unique()();  // JWT ID
   
   BoolColumn get isBlacklisted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))(); // PostgreSQL использует нативный BOOLEAN
   
   Column<PgDateTime> get createdAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   Column<PgDateTime> get expiresAt => customType(PgTypes.timestampWithTimezone)();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')();
+      .withDefault(const Constant(false))();
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
@@ -81,8 +78,7 @@ class TelegramAuthCodes extends Table {
       .withDefault(now())();
   Column<PgDateTime> get expiresAt => customType(PgTypes.timestampWithTimezone)();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')();
+      .withDefault(const Constant(false))();
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
diff --git a/mnemo_cards_backend/lib/database/tables/discounts.dart b/mnemo_cards_backend/lib/database/tables/discounts.dart
index cdb87ea..738bb1b 100644
--- a/mnemo_cards_backend/lib/database/tables/discounts.dart
+++ b/mnemo_cards_backend/lib/database/tables/discounts.dart
@@ -28,8 +28,8 @@ class DiscountCampaigns extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))();
+       // PostgreSQL использует нативный BOOLEAN
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
@@ -59,8 +59,8 @@ class Discounts extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))();
+       // PostgreSQL использует нативный BOOLEAN
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
diff --git a/mnemo_cards_backend/lib/database/tables/packs.dart b/mnemo_cards_backend/lib/database/tables/packs.dart
index b5dd072..501970e 100644
--- a/mnemo_cards_backend/lib/database/tables/packs.dart
+++ b/mnemo_cards_backend/lib/database/tables/packs.dart
@@ -22,8 +22,8 @@ class CardPacks extends Table {
   TextColumn get version => text().nullable()();
   IntColumn get order => integer().withDefault(const Constant(0))();
   BoolColumn get enabled => boolean()
-      .withDefault(const Constant(true))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(true))();
+       // PostgreSQL использует нативный BOOLEAN
   
   // Порядок карточек (JSON array of IDs)
   TextColumn get cardsOrder => text()
@@ -45,8 +45,8 @@ class CardPacks extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))();
+       // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
@@ -81,8 +81,8 @@ class GameCards extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))();
+       // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
diff --git a/mnemo_cards_backend/lib/database/tables/payments.dart b/mnemo_cards_backend/lib/database/tables/payments.dart
index fd579a2..4040905 100644
--- a/mnemo_cards_backend/lib/database/tables/payments.dart
+++ b/mnemo_cards_backend/lib/database/tables/payments.dart
@@ -35,8 +35,8 @@ class Payments extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')();
+      .withDefault(const Constant(false))();
+      
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
diff --git a/mnemo_cards_backend/lib/database/tables/promo_codes.dart b/mnemo_cards_backend/lib/database/tables/promo_codes.dart
index e88d4b2..c6f76a6 100644
--- a/mnemo_cards_backend/lib/database/tables/promo_codes.dart
+++ b/mnemo_cards_backend/lib/database/tables/promo_codes.dart
@@ -38,8 +38,8 @@ class PromoCodesCampaigns extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))();
+       // PostgreSQL использует нативный BOOLEAN
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
@@ -69,8 +69,8 @@ class PromoCodes extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')();
+      .withDefault(const Constant(false))();
+      
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
diff --git a/mnemo_cards_backend/lib/database/tables/statistics.dart b/mnemo_cards_backend/lib/database/tables/statistics.dart
index c8c8b6d..096d5c1 100644
--- a/mnemo_cards_backend/lib/database/tables/statistics.dart
+++ b/mnemo_cards_backend/lib/database/tables/statistics.dart
@@ -30,8 +30,8 @@ class StudySessions extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')();
+      .withDefault(const Constant(false))();
+      
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
diff --git a/mnemo_cards_backend/lib/database/tables/subscriptions.dart b/mnemo_cards_backend/lib/database/tables/subscriptions.dart
index 7345a7b..f82ac37 100644
--- a/mnemo_cards_backend/lib/database/tables/subscriptions.dart
+++ b/mnemo_cards_backend/lib/database/tables/subscriptions.dart
@@ -32,8 +32,8 @@ class SubscriptionPlans extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))();
+       // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};
diff --git a/mnemo_cards_backend/lib/database/tables/tests.dart b/mnemo_cards_backend/lib/database/tables/tests.dart
index 0ed6d7a..d310542 100644
--- a/mnemo_cards_backend/lib/database/tables/tests.dart
+++ b/mnemo_cards_backend/lib/database/tables/tests.dart
@@ -22,8 +22,8 @@ class Tests extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))();
+       // PostgreSQL использует нативный BOOLEAN
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
@@ -49,8 +49,8 @@ class TestQuestions extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')();
+      .withDefault(const Constant(false))();
+      
   Column<PgDateTime> get deletedAt => customType(PgTypes.timestampWithTimezone)
       .nullable()();
   
diff --git a/mnemo_cards_backend/lib/database/tables/users.dart b/mnemo_cards_backend/lib/database/tables/users.dart
index 4c53d91..c1729cc 100644
--- a/mnemo_cards_backend/lib/database/tables/users.dart
+++ b/mnemo_cards_backend/lib/database/tables/users.dart
@@ -11,8 +11,7 @@ class Users extends Table {
   TextColumn get name => text().nullable()();
   TextColumn get email => text().nullable()();
   BoolColumn get admin => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))(); // PostgreSQL использует нативный BOOLEAN
   
   // UserSettings (JSON)
   TextColumn get userSettings => text().nullable()();
@@ -29,8 +28,7 @@ class Users extends Table {
   Column<PgDateTime> get updatedAt => customType(PgTypes.timestampWithTimezone)
       .withDefault(now())();
   BoolColumn get isDeleted => boolean()
-      .withDefault(const Constant(false))
-      .customConstraint('')(); // PostgreSQL использует нативный BOOLEAN
+      .withDefault(const Constant(false))(); // PostgreSQL использует нативный BOOLEAN
   
   @override
   Set<Column> get primaryKey => {id};