added partner model

added import script for reading partners from csv files

gso/services/partners.py

@@ -49,6 +49,8 @@ def create_partner(
         raise
     finally:
         db.session.close()
+    finally:
+        db.session.close()
 
 
 def delete_partner_by_name(name: str) -> None:
@@ -65,3 +67,5 @@ def delete_partner_by_name(name: str) -> None:
         raise
     finally:
         db.session.close()
+    finally:
+        db.session.close()