Close session after execute. (#2677)

homeassistant/components/recorder/__init__.py

@@ -58,6 +58,7 @@ def execute(q):
     This method also retries a few times in the case of stale connections.
     """
     import sqlalchemy.exc
+    try:
         for _ in range(0, RETRIES):
             try:
                 return [
@@ -66,6 +67,8 @@ def execute(q):
                     if row is not None]
             except sqlalchemy.exc.SQLAlchemyError as e:
                 log_error(e, retry_wait=QUERY_RETRY_WAIT, rollback=True)
+    finally:
+        Session().close()
     return []