first commit

migrations/V030__folder_list_preferences.sql

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+ALTER TABLE mail_preferences ADD COLUMN flagged_on_top INTEGER NOT NULL DEFAULT 0;
+
+CREATE TABLE IF NOT EXISTS folder_preferences (
+    folder_name TEXT PRIMARY KEY REFERENCES folders(name) ON UPDATE CASCADE ON DELETE CASCADE,
+    flagged_on_top INTEGER CHECK(flagged_on_top IN (0, 1) OR flagged_on_top IS NULL),
+    updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);