Fix Alembic migration error and database path resolution

- Fix 'No module named app' error by adding project root to Python path
- Ensure consistent database path between app and migrations
- Update database configuration to work in both development and deployment
- Set appropriate SQLite dialect configuration with render_as_batch
- Update documentation with additional migration instructions
- Fix imports order to comply with linting standards

README.md

@@ -68,7 +68,11 @@ pip install -r requirements.txt
 4. Run database migrations:
 
 ```bash
+# Make sure you are in the project root directory
 alembic upgrade head
+
+# If you encounter any module import errors, you can also try:
+PYTHONPATH=$PWD alembic upgrade head
 ```
 
 5. Start the application:

alembic/env.py

@@ -1,15 +1,25 @@
+import sys
 from logging.config import fileConfig
-
+from pathlib import Path
-from sqlalchemy import engine_from_config
-from sqlalchemy import pool
 
 from alembic import context
-from app.db.base import Base
+from sqlalchemy import engine_from_config, pool
+
+# Add the project root directory to Python's module search path
+parent_dir = Path(__file__).parents[1]
+sys.path.append(str(parent_dir))
+
+# Import models after setting up the path
+from app.db.base import Base  # noqa
+from app.db.session import SQLALCHEMY_DATABASE_URL  # noqa
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
 config = context.config
 
+# Override the SQLAlchemy URL in the alembic.ini file
+config.set_main_option("sqlalchemy.url", SQLALCHEMY_DATABASE_URL)
+
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
 fileConfig(config.config_file_name)
@@ -78,4 +88,4 @@ def run_migrations_online():
 if context.is_offline_mode():
     run_migrations_offline()
 else:
-    run_migrations_online()
+    run_migrations_online()

app/db/session.py

@@ -1,8 +1,19 @@
 from pathlib import Path
+import os
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 
-DB_DIR = Path("/app") / "storage" / "db"
+# Get the project root directory
+BASE_DIR = Path(__file__).resolve().parent.parent.parent
+
+# Ensure this works in both development and deployment environments
+if os.path.exists("/app"):
+    # Docker/deployment environment
+    DB_DIR = Path("/app/storage/db")
+else:
+    # Development environment
+    DB_DIR = BASE_DIR / "storage" / "db"
+
 DB_DIR.mkdir(parents=True, exist_ok=True)
 
 SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"