fix(server): add embedding table repair (#14895)

fix #14894


#### PR Dependency Tree


* **PR #14895** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Improved database initialization for self-hosted deployments with
automatic creation and repair of embedding tables and indexes, applied
only when related base tables and extensions are present.
* Updated pre-deploy process to run Prisma migrations, perform
embedding-table maintenance, and execute additional data migrations as
part of setup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/scripts/self-host-predeploy.js

@@ -38,9 +38,32 @@ function prepare() {
   }
 }
 
-function runPredeployScript() {
-  console.log('running predeploy script.');
-  execSync('yarn predeploy', {
+function runPrismaMigrations() {
+  console.log('running prisma migrations.');
+  execSync('yarn prisma migrate deploy', {
+    encoding: 'utf-8',
+    env: process.env,
+    stdio: 'inherit',
+  });
+}
+
+function repairPgvectorEmbeddingTables() {
+  console.log('repairing copilot pgvector embedding tables.');
+  const sql = fs.readFileSync(
+    path.join(import.meta.dirname, 'repair-pgvector-embedding-tables.sql'),
+    'utf-8'
+  );
+  execSync('yarn prisma db execute --stdin --schema schema.prisma', {
+    encoding: 'utf-8',
+    env: process.env,
+    input: sql,
+    stdio: ['pipe', 'inherit', 'inherit'],
+  });
+}
+
+function runDataMigrations() {
+  console.log('running data migrations.');
+  execSync('yarn cli run', {
     encoding: 'utf-8',
     env: process.env,
     stdio: 'inherit',
@@ -85,4 +108,6 @@ function fixFailedMigrations() {
 
 prepare();
 fixFailedMigrations();
-runPredeployScript();
+runPrismaMigrations();
+repairPgvectorEmbeddingTables();
+runDataMigrations();