diff --git a/src/migrations/versions/2025_08_06_2341-197b195208e8_add_cascade_delete_to_tasks.py b/src/migrations/versions/2025_08_06_2341-197b195208e8_add_cascade_delete_to_tasks.py
new file mode 100644
index 0000000..a64aa6b
--- /dev/null
+++ b/src/migrations/versions/2025_08_06_2341-197b195208e8_add_cascade_delete_to_tasks.py
@@ -0,0 +1,65 @@
+"""add_cascade_delete_to_tasks
+
+Revision ID: 197b195208e8
+Revises: a2fdd0ec4a96
+Create Date: 2025-08-06 23:41:56.778423
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '197b195208e8'
+down_revision: Union[str, None] = 'a2fdd0ec4a96'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade():
+    """Upgrade schema."""
+    op.execute("PRAGMA foreign_keys=ON")
+    
+    with op.batch_alter_table('tasks', schema=None) as batch_op:
+        connection = op.get_bind()
+        inspector = sa.inspect(connection)
+        
+        foreign_keys = inspector.get_foreign_keys('tasks')
+        constraint_name = None
+        
+        for fk in foreign_keys:
+            if 'user_id' in fk['constrained_columns']:
+                constraint_name = fk['name']
+                break
+        
+        if constraint_name:
+            try:
+                batch_op.drop_constraint(constraint_name, type_='foreignkey')
+            except:
+                pass
+        
+        batch_op.create_foreign_key(
+            'fk_tasks_user_id_users',
+            'users',
+            ['user_id'],
+            ['id'],
+            ondelete='CASCADE'
+        )
+
+
+def downgrade():
+    """Downgrade schema."""
+    with op.batch_alter_table('tasks', schema=None) as batch_op:
+        try:
+            batch_op.drop_constraint('fk_tasks_user_id_users', type_='foreignkey')
+        except:
+            pass
+        
+        batch_op.create_foreign_key(
+            'fk_tasks_user_id_users',
+            'users',
+            ['user_id'],
+            ['id']
+        )
diff --git a/src/migrations/versions/2025_08_06_2354-4b0f3ea2fd26_fix_duplicate_foreign_keys.py b/src/migrations/versions/2025_08_06_2354-4b0f3ea2fd26_fix_duplicate_foreign_keys.py
new file mode 100644
index 0000000..66d8110
--- /dev/null
+++ b/src/migrations/versions/2025_08_06_2354-4b0f3ea2fd26_fix_duplicate_foreign_keys.py
@@ -0,0 +1,59 @@
+"""fix_duplicate_foreign_keys
+
+Revision ID: 4b0f3ea2fd26
+Revises: 197b195208e8
+Create Date: 2025-08-06 23:54:24.308488
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '4b0f3ea2fd26'
+down_revision: Union[str, None] = '197b195208e8'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade():
+    """Upgrade schema."""
+    op.execute("PRAGMA foreign_keys=ON")
+    
+    with op.batch_alter_table('tasks', schema=None) as batch_op:
+        connection = op.get_bind()
+        inspector = sa.inspect(connection)
+        
+        foreign_keys = inspector.get_foreign_keys('tasks')
+        
+        for fk in foreign_keys:
+            if 'user_id' in fk['constrained_columns']:
+                try:
+                    batch_op.drop_constraint(fk['name'], type_='foreignkey')
+                except:
+                    pass
+        
+        batch_op.create_foreign_key(
+            'fk_tasks_user_id_users',
+            'users',
+            ['user_id'],
+            ['id'],
+            ondelete='CASCADE'
+        )
+
+
+def downgrade():
+    """Downgrade schema."""
+    with op.batch_alter_table('tasks', schema=None) as batch_op:
+        try:
+            batch_op.drop_constraint('fk_tasks_user_id_users', type_='foreignkey')
+        except:
+            pass
+        batch_op.create_foreign_key(
+            'fk_tasks_user_id_users',
+            'users',
+            ['user_id'],
+            ['id']
+        )
diff --git a/src/models/tasks.py b/src/models/tasks.py
index b000446..fb82743 100644
--- a/src/models/tasks.py
+++ b/src/models/tasks.py
@@ -16,7 +16,7 @@ priority_enum = Enum("low", "medium", "high", "critical", name="priority_enum")
 class TasksORM(Base):
     __tablename__ = "tasks"
     id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
-    user_id: Mapped[int] = mapped_column(ForeignKey("users.id"))
+    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"))
     title: Mapped[str] = mapped_column(String(100))
     description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
     due_date: Mapped[Optional[date]] = mapped_column(Date, nullable=True)
diff --git a/src/models/users.py b/src/models/users.py
index 9958677..d11aa13 100644
--- a/src/models/users.py
+++ b/src/models/users.py
@@ -23,4 +23,4 @@ class UsersORM(Base):
     avatar_path: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
     is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
     is_superuser: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
-    tasks: Mapped[list["TasksORM"]] = relationship(back_populates="user")
+    tasks: Mapped[list["TasksORM"]] = relationship(back_populates="user", cascade="all, delete-orphan")