From 3891a2c23911bdea219cc0531a0cde339ce87411 Mon Sep 17 00:00:00 2001
From: mrhid6 <mrhid6@gmail.com>
Date: Fri, 24 Jul 2026 13:59:04 +0100
Subject: [PATCH] feat(server): add rename-rollback command for migration 0004

---
 server/cmd/rename-rollback/main.go | 78 ++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 server/cmd/rename-rollback/main.go

diff --git a/server/cmd/rename-rollback/main.go b/server/cmd/rename-rollback/main.go
new file mode 100644
index 0000000..bb8dee8
--- /dev/null
+++ b/server/cmd/rename-rollback/main.go
@@ -0,0 +1,78 @@
+// Command rename-rollback reverses migration 0004.
+//
+// Run it only as part of a decision to revert the release that introduced the
+// instance rename. It renames instance_id back to org_id and restores the two
+// collection names. Like the migration, it only renames — it deletes no
+// documents.
+//
+//	rename-rollback -uri mongodb://host:27017 -db vantage -confirm
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+	"time"
+
+	"github.com/mrhid6/vantage/server/internal/services"
+	"go.mongodb.org/mongo-driver/v2/bson"
+	"go.mongodb.org/mongo-driver/v2/mongo"
+	"go.mongodb.org/mongo-driver/v2/mongo/options"
+)
+
+func main() {
+	uri := flag.String("uri", "mongodb://localhost:27017", "MongoDB URI")
+	dbName := flag.String("db", "vantage", "database name")
+	confirm := flag.Bool("confirm", false, "required; refuses to run without it")
+	flag.Parse()
+
+	if !*confirm {
+		log.Fatal("refusing to run without -confirm")
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
+	defer cancel()
+
+	client, err := mongo.Connect(options.Client().ApplyURI(*uri))
+	if err != nil {
+		log.Fatalf("connect: %v", err)
+	}
+	defer client.Disconnect(ctx)
+
+	db := client.Database(*dbName)
+
+	for _, c := range services.ScopedCollections {
+		res, err := db.Collection(c).UpdateMany(ctx,
+			bson.M{"instance_id": bson.M{"$exists": true}},
+			bson.M{"$rename": bson.M{"instance_id": "org_id"}},
+		)
+		if err != nil {
+			log.Fatalf("rename instance_id in %s: %v", c, err)
+		}
+		if res.ModifiedCount > 0 {
+			log.Printf("%s: reverted %d document(s)", c, res.ModifiedCount)
+		}
+	}
+
+	for _, r := range []struct{ from, to string }{
+		{"instances", "orgs"},
+		{"instance_oidc", "org_oidc"},
+	} {
+		cmd := bson.D{
+			{Key: "renameCollection", Value: *dbName + "." + r.from},
+			{Key: "to", Value: *dbName + "." + r.to},
+		}
+		if err := client.Database("admin").RunCommand(ctx, cmd).Err(); err != nil {
+			log.Printf("rename %s to %s: %v (continuing)", r.from, r.to, err)
+			continue
+		}
+		log.Printf("renamed collection %s to %s", r.from, r.to)
+	}
+
+	// Remove the marker so a redeployed new binary re-runs the migration.
+	if _, err := db.Collection("migrations").DeleteOne(ctx, bson.M{"_id": "0004_org_to_instance"}); err != nil {
+		log.Printf("clear migration marker: %v", err)
+	}
+
+	log.Println("rollback complete")
+}