fix(db): surface PG error code/detail/cause in voice recording insert failures

Drizzle wraps PG errors — the previous log only showed the formatted query
text. Now extracts code, detail, schema, table, constraint, severity from
the error envelope and from .cause to make the actual Postgres error visible.

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

services/discord-gateway/src/shared/database/voiceRecordingRepo.ts

@@ -40,13 +40,35 @@ export async function insertVoiceRecording(
       .values(recording)
       .onConflictDoNothing();
   } catch (error) {
-    const err = error as Record<string, unknown>;
+    // Drizzle wraps PG errors — dig into cause + enumerable props for the real PG error
+    const err = error as Error & Record<string, unknown>;
     const detail: Record<string, unknown> = {
-      message: error instanceof Error ? error.message : String(error),
-      name: error instanceof Error ? error.name : undefined,
+      message: err.message,
+      name: err.name,
     };
-    if (err.code !== undefined) detail.code = err.code;
-    if (err.detail !== undefined) detail.detail = err.detail;
+    // node-postgres native error props
+    for (const k of [
+      "code",
+      "detail",
+      "schema",
+      "table",
+      "constraint",
+      "severity",
+    ]) {
+      if (err[k] !== undefined) detail[k] = err[k];
+    }
+    // drizzle may stash the original in .cause
+    const cause = err.cause;
+    if (cause instanceof Error) {
+      const causeErr = cause as Error & Record<string, unknown>;
+      detail.cause = {
+        message: causeErr.message,
+        name: causeErr.name,
+        code: causeErr.code,
+        detail: causeErr.detail,
+        constraint: causeErr.constraint,
+      };
+    }
     logger.error(
       { id: recording.id, error: detail },
       "Failed to insert voice recording",