fix: Add migration script to fix coords_3d field in production

Created a migration script that removes and redefines the coords_3d field
to make it optional (TYPE option<array<number>>) in production database.

This fixes the issue where coords_3d was required but should be NONE
until UMAP coordinates are calculated.

Migration successfully executed on production database.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/fix-coords-3d-field.js

@@ -0,0 +1,64 @@
+#!/usr/bin/env node
+
+/**
+ * Migration script to fix coords_3d field to be optional
+ */
+
+const Surreal = require('surrealdb').default;
+
+async function fixCoordsField() {
+  const config = {
+    url: process.env.SURREALDB_URL,
+    username: process.env.SURREALDB_USER,
+    password: process.env.SURREALDB_PASS,
+    namespace: process.env.SURREALDB_NS,
+    database: process.env.SURREALDB_DB,
+  };
+
+  // Validate required config
+  const missing = Object.entries(config)
+    .filter(([_, value]) => !value)
+    .map(([key]) => key);
+
+  if (missing.length > 0) {
+    console.error('[Fix coords_3d] Missing required environment variables:', missing.join(', '));
+    process.exit(1);
+  }
+
+  const db = new Surreal();
+
+  try {
+    console.log('[Fix coords_3d] Connecting to SurrealDB...');
+    await db.connect(config.url);
+
+    console.log('[Fix coords_3d] Signing in...');
+    await db.signin({
+      username: config.username,
+      password: config.password,
+    });
+
+    console.log('[Fix coords_3d] Using namespace and database...');
+    await db.use({
+      namespace: config.namespace,
+      database: config.database,
+    });
+
+    console.log('[Fix coords_3d] Removing old coords_3d field definition...');
+    await db.query('REMOVE FIELD coords_3d ON TABLE node;');
+
+    console.log('[Fix coords_3d] Defining new coords_3d field as optional...');
+    await db.query(`
+      DEFINE FIELD coords_3d ON TABLE node TYPE option<array<number>>
+        ASSERT $value = NONE OR array::len($value) = 3;
+    `);
+
+    console.log('[Fix coords_3d] ✓ Field updated successfully!');
+  } catch (error) {
+    console.error('[Fix coords_3d] ✗ Failed:', error);
+    process.exit(1);
+  } finally {
+    await db.close();
+  }
+}
+
+fixCoordsField();