post_similarities および tag_similarities のマテリアライズド・テーブルのしやぅ変更 #228
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Reference: miteruzo/btrc-hub#228
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以下の変更を行ふ:
id列を廃止*_idとtarget_*_idのペアでユニークpost_idのみで順引きし,逆引きを認めないやぅにする.(post_id, cos)に複合インデクスcos上位 20 件のみ保持するやぅに