fix: indexing on mid

Author: coodos

infrastructure/evault-core/src/core/db/migrations/add-id-indexes.ts

@@ -0,0 +1,50 @@
+/**
+ * Neo4j Migration: Add point-lookup indexes on Envelope.id and MetaEnvelope.id
+ *
+ * Without these, every `MATCH (e:Envelope { id: $id })` and
+ * `MATCH (m:MetaEnvelope { id: $id })` does a NodeByLabelScan over the entire
+ * Envelope / MetaEnvelope population, which scales linearly with total stored
+ * data. Update operations call these queries once per payload field, so a
+ * 5-field chat update can take 10+ seconds.
+ *
+ * `id` is generated by W3IDBuilder and is unique by construction, so a plain
+ * range index on the property is sufficient — no need for a composite index
+ * with eName, since the id alone is selective.
+ */
+
+import type { Driver } from "neo4j-driver";
+
+const STATEMENTS: { name: string; cypher: string }[] = [
+    {
+        name: "envelope_id_index",
+        cypher: `CREATE INDEX envelope_id_index IF NOT EXISTS FOR (e:Envelope) ON (e.id)`,
+    },
+    {
+        name: "meta_envelope_id_index",
+        cypher: `CREATE INDEX meta_envelope_id_index IF NOT EXISTS FOR (m:MetaEnvelope) ON (m.id)`,
+    },
+];
+
+export async function createIdIndexes(driver: Driver): Promise<void> {
+    const session = driver.session();
+    try {
+        for (const { name, cypher } of STATEMENTS) {
+            try {
+                await session.run(cypher);
+                console.log(`Ensured ${name}`);
+            } catch (error) {
+                if (
+                    error instanceof Error &&
+                    error.message.includes("already exists")
+                ) {
+                    console.log(`${name} already exists`);
+                } else {
+                    console.error(`Error creating ${name}:`, error);
+                    throw error;
+                }
+            }
+        }
+    } finally {
+        await session.close();
+    }
+}

infrastructure/evault-core/src/index.ts

@@ -115,6 +115,17 @@ const initializeEVault = async (
         console.warn("Failed to create User index:", error);
     }
 
+    // Create id indexes on Envelope and MetaEnvelope so per-field point
+    // lookups inside updateMetaEnvelopeById don't scan the whole label.
+    try {
+        const { createIdIndexes } = await import(
+            "./core/db/migrations/add-id-indexes"
+        );
+        await createIdIndexes(driver);
+    } catch (error) {
+        console.warn("Failed to create id indexes:", error);
+    }
+
     // Migrate publicKey (string) to publicKeys (array)
     try {
         const { migratePublicKeyToArray } = await import(