fix: composite index on heartbeats table

migrations/20221028_fix_heartbeats_time_user_idx.go

@@ -0,0 +1,41 @@
+package migrations
+
+import (
+	"github.com/emvi/logbuch"
+	"github.com/muety/wakapi/config"
+	"github.com/muety/wakapi/models"
+	"gorm.io/gorm"
+)
+
+// due to an error in the model definition, idx_time_user used to only cover 'user_id', but not time column
+// if that's the case in the current state of the database, drop the index and let it be recreated by auto migration afterwards
+func init() {
+	const name = "20221028-fix_heartbeats_time_user_idx"
+	f := migrationFunc{
+		name: name,
+		f: func(db *gorm.DB, cfg *config.Config) error {
+			migrator := db.Migrator()
+
+			indexes, err := migrator.GetIndexes(&models.Heartbeat{})
+			if err != nil {
+				return err
+			}
+
+			for _, idx := range indexes {
+				if idx.Table() == "heartbeats" && idx.Name() == "idx_time_user" {
+					if len(idx.Columns()) == 1 {
+						if err := migrator.DropIndex(&models.Heartbeat{}, "idx_time_user"); err != nil {
+							return err
+						}
+						logbuch.Info("index 'idx_time_user' needs to be recreated, this may take a while")
+						return nil
+					}
+				}
+			}
+
+			return nil
+		},
+	}
+
+	registerPreMigration(f)
+}