Refactoring + additional SQL functions

hive/db/sql_scripts/condenser_get_account_reputations.sql

+DROP FUNCTION IF EXISTS condenser_get_account_reputations;
+
+CREATE OR REPLACE FUNCTION condenser_get_account_reputations(
+  in _account_lower_bound VARCHAR,
+  in _without_lower_bound BOOLEAN,
+  in _limit INTEGER
+)
+RETURNS TABLE
+(
+    name hive_accounts.name%TYPE,
+    reputation hive_accounts.reputation%TYPE
+)
+AS
+$function$
+DECLARE
+
+BEGIN
+
+    RETURN QUERY SELECT
+      ha.name, ha.reputation
+    FROM hive_accounts ha
+    WHERE _without_lower_bound OR ( ha.name >= _account_lower_bound )
+    ORDER BY name
+    LIMIT _limit;
+
+END
+$function$
+language plpgsql STABLE;