feat(orm): add pool_size parameter to get_postgres_engine for connection management

python/orm/common.py

@@ -36,6 +36,7 @@ def get_postgres_engine(
     name: str = "POSTGRES",
     pool_pre_ping: bool = True,
     vector_engine: bool = False,
+    pool_size: int = 8,
 ) -> Engine:
     """Create a SQLAlchemy engine from environment variables.
 
@@ -45,6 +46,7 @@ def get_postgres_engine(
         This fixes the issue of trying to use a conection that has timed out on the database side.
         vector_engine (bool, optional): Whether to use the vector search schema. Defaults to False.
         This updates the search path the incldued the vecore types and operators.
+        pool_size (int, optional): Number of connections to keep in the pool. Defaults to 8.
 
     Returns:
         Engine: The SQLAlchemy engine.
@@ -70,4 +72,5 @@ def get_postgres_engine(
         pool_pre_ping=pool_pre_ping,
         pool_recycle=1800,
         connect_args=connect_args,
+        pool_size=pool_size,
     )