fix(scheduler): use equals: null filter for endDate to satisfy Prisma where syntax and stop log spam

backend/prisma/schema.prisma

@@ -317,6 +317,7 @@ model MatchingRun {
 
   // Relations
   event          Event    @relation(fields: [eventId], references: [id], onDelete: Cascade)
+  suggestions    RecordingSuggestion[]
 
   @@index([eventId, startedAt])
   @@map("matching_runs")

backend/src/app.js

@@ -87,6 +87,11 @@ if (securityConfig.csrf.enabled) {
     }
     next(err);
   });
+} else {
+  // Provide a harmless CSRF endpoint in development when CSRF is disabled
+  app.get('/api/csrf-token', (req, res) => {
+    res.json({ csrfToken: null, disabled: true });
+  });
 }
 
 // Request logging middleware

backend/src/services/scheduler.js

@@ -22,7 +22,7 @@ async function listCandidateEvents() {
       // Include events that end today or in the future
       OR: [
         { endDate: { gte: now } },
-        { endDate: null },
+        { endDate: { equals: null } },
       ],
     },
     select: {