fix: detect postgres dbType and make agent upstream optional

- SlowQueriesSection: Accept both 'postgres' and 'postgresql' dbType
  The API returns dbType as 'postgres' but the code only checked for 'postgresql'

- nginx: Use resolver for deepsql-agent upstream
  Makes hostname resolution happen at request time instead of startup,
  allowing nginx to start even when deepsql-agent container is down

Co-authored-by: Venkat SF <venkatesh.sakamuri@stayflexi.com>

Author: cursoragent

docker/nginx/default.conf

@@ -107,10 +107,13 @@ server {
         auth_request /__agent_auth;
         auth_request_set $deepsql_user $upstream_http_x_remote_user;
 
-        # Compose service on the internal network. Literal hostname resolves
-        # via Docker DNS. If the agent container is down this route returns
-        # 502 and the rest of the UI keeps working.
-        proxy_pass         http://deepsql-agent:8787/;
+        # Compose service on the internal network. Using a variable in proxy_pass
+        # forces nginx to resolve the hostname at request time, not at startup.
+        # This allows nginx to start even if deepsql-agent is down or restarting.
+        # Docker's embedded DNS (127.0.0.11) handles container name resolution.
+        resolver 127.0.0.11 valid=10s ipv6=off;
+        set $agent_upstream http://deepsql-agent:8787;
+        proxy_pass         $agent_upstream/;
         proxy_http_version 1.1;
         # The agent API CSRF compares Origin host:port to Host. `$host` drops
         # the port (localhost vs localhost:3000) and profile/switch returns 403

src/components/sections/SlowQueriesSection.jsx

@@ -45,7 +45,7 @@ export default function SlowQueriesSection() {
   const hasLogSource = Boolean(logSourceQ.data?.id)
 
   // PostgreSQL connections can use pg_stat_statements directly without a log source
-  const isPostgres = selectedConnection?.dbType?.toLowerCase() === 'postgresql'
+  const isPostgres = ['postgresql', 'postgres'].includes(selectedConnection?.dbType?.toLowerCase())
   const canShowPerformance = hasLogSource || isPostgres
 
   // Filter tabs based on available data sources