[#5618] added support to conditionally reapply migrations

migrations/1640988000_aux_init.go

@@ -0,0 +1,36 @@
+package migrations
+
+import (
+	"github.com/pocketbase/pocketbase/core"
+)
+
+func init() {
+	core.SystemMigrations.Add(&core.Migration{
+		Up: func(txApp core.App) error {
+			_, execErr := txApp.AuxDB().NewQuery(`
+				CREATE TABLE IF NOT EXISTS {{_logs}} (
+					[[id]]      TEXT PRIMARY KEY DEFAULT ('r'||lower(hex(randomblob(7)))) NOT NULL,
+					[[level]]   INTEGER DEFAULT 0 NOT NULL,
+					[[message]] TEXT DEFAULT "" NOT NULL,
+					[[data]]    JSON DEFAULT "{}" NOT NULL,
+					[[created]] TEXT DEFAULT (strftime('%Y-%m-%d %H:%M:%fZ')) NOT NULL
+				);
+
+				CREATE INDEX IF NOT EXISTS idx_logs_level on {{_logs}} ([[level]]);
+				CREATE INDEX IF NOT EXISTS idx_logs_message on {{_logs}} ([[message]]);
+				CREATE INDEX IF NOT EXISTS idx_logs_created_hour on {{_logs}} (strftime('%Y-%m-%d %H:00:00', [[created]]));
+			`).Execute()
+
+			return execErr
+		},
+		Down: func(txApp core.App) error {
+			_, err := txApp.AuxDB().DropTable("_logs").Execute()
+			return err
+		},
+		ReapplyCondition: func(txApp core.App, runner *core.MigrationsRunner, fileName string) (bool, error) {
+			// reapply only if the _logs table doesn't exist
+			exists := txApp.AuxHasTable("_logs")
+			return !exists, nil
+		},
+	})
+}