Fix Supabase OR filter syntax

src/hooks/useModerationQueue.ts

@@ -324,6 +324,7 @@ export const useModerationQueue = (config?: UseModerationQueueConfig) => {
         .single();
 
       const expiresAt = new Date(Date.now() + 15 * 60 * 1000);
+      const now = new Date().toISOString();
       
       const { error } = await supabase
         .from('content_submissions')
@@ -333,7 +334,7 @@ export const useModerationQueue = (config?: UseModerationQueueConfig) => {
           locked_until: expiresAt.toISOString(),
         })
         .eq('id', submissionId)
-        .or(`assigned_to.is.null,locked_until.lt.${new Date().toISOString()}`); // Only if unclaimed or lock expired
+        .or(`assigned_to.is.null,locked_until.lt."${now}"`); // Only if unclaimed or lock expired
 
       if (error) throw error;
 

src/lib/moderation/validation.ts

@@ -72,7 +72,7 @@ export const ModerationItemSchema = z.object({
   user_profile: LegacyProfileSchema.optional().nullable(),
   
   // Submission items
-  submission_items: z.array(SubmissionItemSchema).optional(),
+  submission_items: z.array(SubmissionItemSchema).optional().nullable(),
   
   // Entity names
   entity_name: z.string().optional(),