feat: implement real-time database synchronization with SSE and update backend modules

backend/src/prisma/prisma.service.ts

@@ -1,5 +1,6 @@
 import { Injectable, Logger, OnModuleDestroy, OnModuleInit } from '@nestjs/common';
-import { PrismaClient } from '@prisma/client';
+import { Prisma, PrismaClient } from '@prisma/client';
+import { RealtimeEventsService } from '../realtime/realtime-events.service';
 
 @Injectable()
 export class PrismaService
@@ -7,9 +8,30 @@ export class PrismaService
   implements OnModuleInit, OnModuleDestroy
 {
   private readonly logger = new Logger(PrismaService.name);
+  private readonly writeActions = new Set<string>([
+    'create',
+    'update',
+    'upsert',
+    'delete',
+    'createMany',
+    'updateMany',
+    'deleteMany',
+  ]);
 
-  constructor() {
+  constructor(private readonly realtimeEvents: RealtimeEventsService) {
     super();
+
+    const realtimeMiddleware: Prisma.Middleware = async (params, next) => {
+      const result = await next(params);
+
+      if (params.model && this.writeActions.has(params.action)) {
+        this.realtimeEvents.notifyDatabaseWrite();
+      }
+
+      return result;
+    };
+
+    this.$use(realtimeMiddleware);
   }
 
   async onModuleInit() {