feat(vacay): add manual school holiday calendars

server/src/db/migrations.ts

@@ -4534,6 +4534,26 @@ function runMigrations(db: Database.Database): void {
         db.exec('ALTER TABLE places ADD COLUMN fill_percent INTEGER');
       }
     },
+    () => {
+      db.exec(`
+        CREATE TABLE IF NOT EXISTS school_holiday_countries (
+          code TEXT PRIMARY KEY, name TEXT NOT NULL
+        );
+        CREATE TABLE IF NOT EXISTS school_holiday_regions (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          country TEXT NOT NULL REFERENCES school_holiday_countries(code),
+          name TEXT NOT NULL COLLATE NOCASE, revision INTEGER NOT NULL DEFAULT 1,
+          UNIQUE(country, name)
+        );
+        CREATE TABLE IF NOT EXISTS school_holiday_periods (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          region_id INTEGER NOT NULL REFERENCES school_holiday_regions(id) ON DELETE CASCADE,
+          name TEXT NOT NULL, start_date TEXT NOT NULL, end_date TEXT NOT NULL,
+          CHECK (end_date >= start_date)
+        );
+        CREATE INDEX IF NOT EXISTS idx_school_holiday_periods_region ON school_holiday_periods(region_id);
+      `);
+    },
   ];
 
   if (currentVersion < migrations.length) {