add special method

api/additional_methods.py

@@ -0,0 +1,17 @@
+
+from db import dbGetMany, dbGetOne, dbInsert, dbUpdate
+from loguru import logger
+import werkzeug
+
+
+
+
+def get_overhead_advances_by_flat(user, token_info, flatId=None):
+    return dbGetMany(user, token_info, {
+            "statement": """
+SELECT o.id ,o.description ,o.amount ,o.startdate ,o.enddate
+  FROM overhead_advance_t o, overhead_advance_flat_mapping_t m
+  WHERE o.id = m.overhead_advance and m.flat = %s""", 
+            "params": (flatId, )
+        }
+    )