DAR-1350 "Fix" for DAR-1350

**DO NOT MERGE!!!**
Darwin/Bad boys team will merge it after QA session

After few hours of trying to reproduce the bug (duplicate records in `wall_history` table) [DAR-1350](https://wikia-inc.atlassian.net/browse/DAR-1350) we decided to implement a fix which is a work-around. It'll fix the forum related pages but will not remove root cause which is unknown for now. We found several worrisome issues with `wall_history`. We'll investigate it more [DAR-2123](https://wikia-inc.atlassian.net/browse/DAR-2123)

**DO NOT MERGE!!!**
Darwin/Bad boys team will merge it after review and QA session