Update user_id for bigint and update secure

alembic/versions/44f93e0fb396_change_user_id_to_bigint.py

@@ -0,0 +1,66 @@
+"""change_user_id_to_bigint
+
+Revision ID: 44f93e0fb396
+Revises: 7ac28bbbc5ee
+Create Date: 2025-12-04 01:38:07.580350
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '44f93e0fb396'
+down_revision: Union[str, Sequence[str], None] = '7ac28bbbc5ee'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # Change user_id from Integer to BigInteger in all tables
+    # PostgreSQL allows direct type change from INTEGER to BIGINT
+    
+    # First, change foreign keys in tasks table
+    op.alter_column('tasks', 'user_id',
+                    existing_type=sa.Integer(),
+                    type_=sa.BigInteger(),
+                    existing_nullable=False)
+    
+    # Change foreign key in otp_codes table
+    op.alter_column('otp_codes', 'user_id',
+                    existing_type=sa.Integer(),
+                    type_=sa.BigInteger(),
+                    existing_nullable=False)
+    
+    # Finally, change primary key in users table
+    op.alter_column('users', 'user_id',
+                    existing_type=sa.Integer(),
+                    type_=sa.BigInteger(),
+                    existing_nullable=False)
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # Change user_id back from BigInteger to Integer
+    # Note: This may fail if there are values larger than INTEGER max value
+    
+    # Change primary key in users table first
+    op.alter_column('users', 'user_id',
+                    existing_type=sa.BigInteger(),
+                    type_=sa.Integer(),
+                    existing_nullable=False)
+    
+    # Change foreign key in otp_codes table
+    op.alter_column('otp_codes', 'user_id',
+                    existing_type=sa.BigInteger(),
+                    type_=sa.Integer(),
+                    existing_nullable=False)
+    
+    # Change foreign key in tasks table
+    op.alter_column('tasks', 'user_id',
+                    existing_type=sa.BigInteger(),
+                    type_=sa.Integer(),
+                    existing_nullable=False)