fix: explicit milliseconds precision of timestamp columns

migrations/20220318_mysql_timestamp_precision.go

@@ -0,0 +1,41 @@
+package migrations
+
+import (
+	"github.com/emvi/logbuch"
+	"github.com/muety/wakapi/config"
+	"gorm.io/gorm"
+)
+
+func init() {
+	const name = "20220318-mysql_timestamp_precision"
+	f := migrationFunc{
+		name: name,
+		f: func(db *gorm.DB, cfg *config.Config) error {
+			if hasRun(name, db) {
+				return nil
+			}
+
+			if cfg.Db.IsMySQL() {
+				logbuch.Info("altering heartbeats table, this may take a while (up to hours)")
+
+				db.Exec("SET foreign_key_checks=0;")
+				db.Exec("SET unique_checks=0;")
+				if err := db.Exec("ALTER TABLE heartbeats MODIFY COLUMN `time` TIMESTAMP(3) NOT NULL").Error; err != nil {
+					return err
+				}
+				if err := db.Exec("ALTER TABLE heartbeats MODIFY COLUMN `created_at` TIMESTAMP(3) NOT NULL").Error; err != nil {
+					return err
+				}
+				db.Exec("SET foreign_key_checks=1;")
+				db.Exec("SET unique_checks=1;")
+
+				logbuch.Info("migrated timestamp columns to millisecond precision")
+			}
+
+			setHasRun(name, db)
+			return nil
+		},
+	}
+
+	registerPostMigration(f)
+}