feat: complete IM P0 and P1 reliability work

scripts/apply_group_business_tables.go

@@ -24,6 +24,13 @@ func main() {
 	if err = db.Ping(); err != nil {
 		fatal(err)
 	}
+	var schema string
+	if err = db.QueryRow("SELECT DATABASE()").Scan(&schema); err != nil {
+		fatal(err)
+	}
+	if strings.TrimSpace(schema) == "" {
+		fatal("IM_MYSQL_DSN must select a tenant database")
+	}
 
 	raw, err := os.ReadFile("docs/IM-群聊业务表设计.sql")
 	if err != nil {
@@ -39,7 +46,7 @@ func main() {
 			fatal(fmt.Errorf("exec failed: %s: %w", stmt, err))
 		}
 	}
-	fmt.Println("group business tables applied")
+	fmt.Printf("group business tables applied to %s\n", schema)
 }
 
 func stripSQLLineComments(text string) string {