customize pool_size and max_overflow

Author: ssadhu-sl

application/db/session.py

@@ -5,10 +5,17 @@
 from sqlalchemy.orm import Session
 
 from application.settings import get_settings
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 # this can be used in fast api path functions using Depends to inject a db session
 def get_session() -> Iterator[Session]:
+    logger.info(
+        f"Database engine created with pool_size={get_settings().DB_POOL_SIZE}, "
+        f"max_overflow={get_settings().DB_POOL_MAX_OVERFLOW}"
+    )
     yield from _get_fastapi_sessionmaker().get_db()
 
 

migrations/env.py

@@ -65,14 +65,8 @@ def run_migrations_online():
         url = config.get_main_option("sqlalchemy.url")
     else:
         url = get_settings().WRITE_DATABASE_URL
-    engine = create_engine(
-        url,
-        pool_size=get_settings().DB_POOL_SIZE,
-        max_overflow=get_settings().DB_POOL_MAX_OVERFLOW,
-    )
-    logging.info(
-        f"Connection Pool: pool_size={engine.pool.size()}, max_overflow={engine.pool._max_overflow}"
-    )
+
+    engine = create_engine(url)
     connectable = engine
 
     with connectable.connect() as connection: