feature: version one notification feature implemented.

backend/prisma/migrations/20260718120000_user_notifications/migration.sql

@@ -0,0 +1,41 @@
+-- CreateEnum
+CREATE TYPE "UserNotificationType" AS ENUM (
+  'CASE_SENT',
+  'CLINIC_COMMENT',
+  'LAB_COMMENT',
+  'LAB_COMMENT_CLINIC',
+  'CASE_IMPORTANT',
+  'TASK_COMPLETED',
+  'TASK_ASSIGNED',
+  'CONNECTION_REQUEST',
+  'STAFF_INVITE'
+);
+
+-- CreateTable
+CREATE TABLE "user_notifications" (
+  "id" TEXT NOT NULL,
+  "userId" TEXT NOT NULL,
+  "organizationId" TEXT NOT NULL,
+  "type" "UserNotificationType" NOT NULL,
+  "actorUserId" TEXT,
+  "payload" JSONB,
+  "href" TEXT NOT NULL,
+  "readAt" TIMESTAMP(3),
+  "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+  CONSTRAINT "user_notifications_pkey" PRIMARY KEY ("id")
+);
+
+CREATE INDEX "user_notifications_userId_organizationId_createdAt_idx"
+  ON "user_notifications"("userId", "organizationId", "createdAt");
+
+CREATE INDEX "user_notifications_userId_organizationId_readAt_idx"
+  ON "user_notifications"("userId", "organizationId", "readAt");
+
+ALTER TABLE "user_notifications"
+  ADD CONSTRAINT "user_notifications_userId_fkey"
+  FOREIGN KEY ("userId") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE "user_notifications"
+  ADD CONSTRAINT "user_notifications_actorUserId_fkey"
+  FOREIGN KEY ("actorUserId") REFERENCES "users"("id") ON DELETE SET NULL ON UPDATE CASCADE;