Database api fixes

• Add date validator,
• Add post validator,
• Add parameters checks to database_api methods,
• API behaviour matching hived for selected api calls

added 14 commits

• 7ed54e6f...eba04c89 - 13 commits from branch develop
• 7ba84d4e - Merge branch 'dk-database-api-001' of gitlab.syncad.com:hive/hivemind into dk-database-api-001

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added 1 commit

• 8dd17872 - Post validation moved to SQL

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added 3 commits

• 8dd17872...6966f466 - 2 commits from branch develop
• 66f14945 - Rebase

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resolved all threads

added To Do label

added 1 commit

• 8e1ca759 - Added post exist check in find_comment_id

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resolved all threads

added 3 commits

• 8e1ca759...ab277b83 - 2 commits from branch develop
• e3eece37 - Rebase to current develop

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merged

mentioned in commit ae436d8d