Fix SQLAlchemy 2.0 database migration error

- Update migrations/env.py to use SQLAlchemy 2.0 compatible syntax
- Import text class from sqlalchemy for executing raw SQL
- Convert connection.execute() call to use text() for PRAGMA statements
- Fix the database migration error for SQLite foreign keys

migrations/env.py

@@ -2,7 +2,7 @@ from logging.config import fileConfig
 import os
 import sys
 from alembic import context
-from sqlalchemy import engine_from_config, pool
+from sqlalchemy import engine_from_config, pool, text
 
 # Add the parent directory to sys.path
 sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
@@ -78,7 +78,7 @@ def run_migrations_online():
 
         # For SQLite, enable foreign keys
         if is_sqlite:
-            connection.execute("PRAGMA foreign_keys=ON")
+            connection.execute(text("PRAGMA foreign_keys=ON"))
 
         with context.begin_transaction():
             context.run_migrations()