fix(db): make three more migrations idempotent; log swallowed login DB error

Same class of bug as the ai_plans_and_limits fix: ai_credit_packages and
users_litellm_key used plain CREATE TABLE/ADD COLUMN with no re-run guard,
and payu_rename_columns did a bare RENAME COLUMN that fails outright on any
second run ("column razorpay_order_id does not exist"). All three were
discovered by actually running the db-migrate job end to end for the first
time and fixed in the same pass as the verification_logs FK fix - already
baked into the db-migrate image that was built and run manually, this
commit just brings the source in the repo in sync with what's deployed.

Also: apps/employees login handler's DB error was being discarded via
.map_err(|_| ...) with zero logging, making the reported "db error while
logging in" impossible to diagnose from pod logs. Log the real error.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/employees/src/handlers/auth.rs

@@ -70,7 +70,10 @@ async fn login(
 
     let employee = EmployeeRepository::get_by_email(&state.pool, &email)
         .await
-        .map_err(|_| err(StatusCode::INTERNAL_SERVER_ERROR, "DB error", "DB_ERROR"))?
+        .map_err(|e| {
+            tracing::error!(error = %e, email = %email, "employee login: get_by_email failed");
+            err(StatusCode::INTERNAL_SERVER_ERROR, "DB error", "DB_ERROR")
+        })?
         .ok_or_else(|| err(StatusCode::UNAUTHORIZED, "Invalid credentials", "INVALID_CREDENTIALS"))?;
 
     if employee.status != "ACTIVE" {

crates/db/migrations/20260615060600_ai_credit_packages.up.sql

@@ -1,4 +1,4 @@
-CREATE TABLE ai_credit_packages (
+CREATE TABLE IF NOT EXISTS ai_credit_packages (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     name VARCHAR(150) NOT NULL,
     description TEXT,
@@ -9,10 +9,16 @@ CREATE TABLE ai_credit_packages (
     updated_at TIMESTAMP NOT NULL DEFAULT NOW()
 );
 
-CREATE INDEX idx_ai_credit_packages_active ON ai_credit_packages(is_active, price_inr);
+CREATE INDEX IF NOT EXISTS idx_ai_credit_packages_active ON ai_credit_packages(is_active, price_inr);
 
-INSERT INTO ai_credit_packages (name, description, credits, price_inr) VALUES
-('Starter AI Credits', '50 AI credits for casual usage', 50, 99),
-('Pro AI Credits', '200 AI credits for power users', 200, 349),
-('Business AI Credits', '750 AI credits for teams', 750, 999),
-('Enterprise AI Credits', '2500 AI credits for heavy usage', 2500, 2499);
+-- name has no unique constraint to key an ON CONFLICT off of, so guard the
+-- whole seed on the table being empty (this migration only ever ran once
+-- successfully; a second run inserted zero extra rows before this fix).
+INSERT INTO ai_credit_packages (name, description, credits, price_inr)
+SELECT * FROM (VALUES
+    ('Starter AI Credits', '50 AI credits for casual usage', 50, 99),
+    ('Pro AI Credits', '200 AI credits for power users', 200, 349),
+    ('Business AI Credits', '750 AI credits for teams', 750, 999),
+    ('Enterprise AI Credits', '2500 AI credits for heavy usage', 2500, 2499)
+) AS v(name, description, credits, price_inr)
+WHERE NOT EXISTS (SELECT 1 FROM ai_credit_packages);

crates/db/migrations/20260626000000_payu_rename_columns.up.sql

@@ -1,5 +1,14 @@
 -- Rename Razorpay columns to PayU equivalents on the payments table.
 -- PayU uses `txnid` (transaction id) and `mihpayid` (PayU payment id) instead of Razorpay's order_id / payment_id.
+-- Guarded so re-running after the first successful rename is a no-op instead
+-- of failing with "column razorpay_order_id does not exist".
 
-ALTER TABLE payments RENAME COLUMN razorpay_order_id TO payu_txnid;
-ALTER TABLE payments RENAME COLUMN razorpay_payment_id TO payu_mihpayid;
+DO $$
+BEGIN
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'payments' AND column_name = 'razorpay_order_id') THEN
+        ALTER TABLE payments RENAME COLUMN razorpay_order_id TO payu_txnid;
+    END IF;
+    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'payments' AND column_name = 'razorpay_payment_id') THEN
+        ALTER TABLE payments RENAME COLUMN razorpay_payment_id TO payu_mihpayid;
+    END IF;
+END $$;

crates/db/migrations/20260716500000_users_litellm_key.up.sql

@@ -3,6 +3,6 @@
 
 BEGIN;
 
-ALTER TABLE users ADD COLUMN litellm_key TEXT;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS litellm_key TEXT;
 
 COMMIT;