feat(backend): Prisma schema, Express routes, audit middleware, error handling

backend/prisma/migrations/20240101000000_init/migration.sql

@@ -0,0 +1,49 @@
+-- CreateTable
+CREATE TABLE "experiments" (
+    "id" TEXT NOT NULL,
+    "title" TEXT NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "experiments_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "animals" (
+    "id" TEXT NOT NULL,
+    "experiment_id" TEXT NOT NULL,
+    "animal_id_string" TEXT NOT NULL,
+    "animal_name" TEXT NOT NULL,
+
+    CONSTRAINT "animals_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "daily_statuses" (
+    "id" TEXT NOT NULL,
+    "animal_id" TEXT NOT NULL,
+    "date" DATE NOT NULL,
+    "experiment_description" TEXT,
+    "vitals" TEXT,
+    "treatment" TEXT,
+    "notes" TEXT,
+
+    CONSTRAINT "daily_statuses_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "audit_logs" (
+    "id" TEXT NOT NULL,
+    "table_name" TEXT NOT NULL,
+    "record_id" TEXT NOT NULL,
+    "action" TEXT NOT NULL,
+    "changes" JSONB NOT NULL,
+    "timestamp" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "audit_logs_pkey" PRIMARY KEY ("id")
+);
+
+-- AddForeignKey
+ALTER TABLE "animals" ADD CONSTRAINT "animals_experiment_id_fkey" FOREIGN KEY ("experiment_id") REFERENCES "experiments"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "daily_statuses" ADD CONSTRAINT "daily_statuses_animal_id_fkey" FOREIGN KEY ("animal_id") REFERENCES "animals"("id") ON DELETE CASCADE ON UPDATE CASCADE;

backend/prisma/migrations/migration_lock.toml

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+# Please do not edit this file manually
+# It should be added in your version-control system (i.e. Git)
+provider = "postgresql"

backend/prisma/schema.prisma

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+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model Experiment {
+  id         String   @id @default(uuid())
+  title      String
+  created_at DateTime @default(now())
+  animals    Animal[]
+
+  @@map("experiments")
+}
+
+model Animal {
+  id               String        @id @default(uuid())
+  experiment_id    String
+  animal_id_string String
+  animal_name      String
+  experiment       Experiment    @relation(fields: [experiment_id], references: [id], onDelete: Cascade)
+  daily_statuses   DailyStatus[]
+
+  @@map("animals")
+}
+
+model DailyStatus {
+  id                     String   @id @default(uuid())
+  animal_id              String
+  date                   DateTime @db.Date
+  experiment_description String?
+  vitals                 String?
+  treatment              String?
+  notes                  String?
+  animal                 Animal   @relation(fields: [animal_id], references: [id], onDelete: Cascade)
+
+  @@map("daily_statuses")
+}
+
+model AuditLog {
+  id         String   @id @default(uuid())
+  table_name String
+  record_id  String
+  action     String
+  changes    Json
+  timestamp  DateTime @default(now())
+
+  @@map("audit_logs")
+}