init commit

store/migration/mysql/0.24/01__memo_pinned.sql

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+-- Add pinned column.
+ALTER TABLE `memo` ADD COLUMN `pinned` BOOLEAN NOT NULL DEFAULT FALSE;
+
+-- Update pinned column from memo_organizer.
+UPDATE memo
+JOIN memo_organizer ON memo.id = memo_organizer.memo_id
+SET memo.pinned = TRUE
+WHERE memo_organizer.pinned = 1;