feature: a minimal implementation of the appointment feature done.

backend/prisma/migrations/20260506163313_add_appointments/migration.sql

@@ -0,0 +1,26 @@
+-- CreateTable
+CREATE TABLE "appointments" (
+    "id" TEXT NOT NULL,
+    "organizationId" TEXT NOT NULL,
+    "patientId" TEXT NOT NULL,
+    "providerUserId" TEXT NOT NULL,
+    "startAt" TIMESTAMP(3) NOT NULL,
+    "endAt" TIMESTAMP(3) NOT NULL,
+    "purpose" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "appointments_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE INDEX "appointments_organizationId_providerUserId_startAt_idx" ON "appointments"("organizationId", "providerUserId", "startAt");
+
+-- CreateIndex
+CREATE INDEX "appointments_organizationId_startAt_idx" ON "appointments"("organizationId", "startAt");
+
+-- AddForeignKey
+ALTER TABLE "appointments" ADD CONSTRAINT "appointments_organizationId_fkey" FOREIGN KEY ("organizationId") REFERENCES "organizations"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "appointments" ADD CONSTRAINT "appointments_patientId_fkey" FOREIGN KEY ("patientId") REFERENCES "patients"("id") ON DELETE CASCADE ON UPDATE CASCADE;