feat: Daily Walkthrough Database Schema

🔴 Phase 1.5: Daily Operations for 777 Wolfpack

✅ Database Schema Complete:
- DailyWalkthrough model (parent walkthrough session)
- ReservoirCheck model (tank levels, veg/flower)
- IrrigationCheck model (drippers, water flow, nutrients, 4 zones)
- PlantHealthCheck model (pests, water/food access, photos)

📊 New Enums:
- WalkthroughStatus (IN_PROGRESS, COMPLETED, INCOMPLETE)
- TankType (VEG, FLOWER)
- TankStatus (OK, LOW, CRITICAL)
- HealthStatus (GOOD, FAIR, NEEDS_ATTENTION)
- AccessStatus (OK, ISSUES)

🔗 Relationships:
- User → DailyWalkthrough (one-to-many)
- DailyWalkthrough → ReservoirCheck (one-to-many, cascade delete)
- DailyWalkthrough → IrrigationCheck (one-to-many, cascade delete)
- DailyWalkthrough → PlantHealthCheck (one-to-many, cascade delete)

📝 Features:
- Photo URLs for all check types
- JSON storage for failed dripper IDs
- Cascade delete (cleanup on walkthrough deletion)
- Timestamps for audit trail
- Status tracking (in progress → completed)

⏭️ Next: Migration + Backend API endpoints

Migration Command (run on deployment):
npx prisma migrate dev --name add_daily_walkthrough

backend/prisma/schema.prisma

@@ -30,6 +30,35 @@ enum TaskStatus {
   BLOCKED
 }
 
+// Daily Walkthrough Enums
+enum WalkthroughStatus {
+  IN_PROGRESS
+  COMPLETED
+  INCOMPLETE
+}
+
+enum TankType {
+  VEG
+  FLOWER
+}
+
+enum TankStatus {
+  OK
+  LOW
+  CRITICAL
+}
+
+enum HealthStatus {
+  GOOD
+  FAIR
+  NEEDS_ATTENTION
+}
+
+enum AccessStatus {
+  OK
+  ISSUES
+}
+
 model User {
   id            String     @id @default(uuid())
   email         String     @unique
@@ -42,6 +71,7 @@ model User {
 
   tasks         TaskInstance[]
   timeLogs      TimeLog[]
+  walkthroughs  DailyWalkthrough[]
 
   @@map("users")
 }
@@ -133,3 +163,81 @@ model TimeLog {
 
   @@map("time_logs")
 }
+
+// Daily Walkthrough Models
+model DailyWalkthrough {
+  id          String            @id @default(uuid())
+  date        DateTime          @default(now())
+  completedBy String
+  user        User              @relation(fields: [completedBy], references: [id])
+  startTime   DateTime          @default(now())
+  endTime     DateTime?
+  status      WalkthroughStatus @default(IN_PROGRESS)
+  
+  reservoirChecks   ReservoirCheck[]
+  irrigationChecks  IrrigationCheck[]
+  plantHealthChecks PlantHealthCheck[]
+  
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+
+  @@map("daily_walkthroughs")
+}
+
+model ReservoirCheck {
+  id              String           @id @default(uuid())
+  walkthroughId   String
+  walkthrough     DailyWalkthrough @relation(fields: [walkthroughId], references: [id], onDelete: Cascade)
+  
+  tankName        String
+  tankType        TankType
+  levelPercent    Int
+  status          TankStatus
+  photoUrl        String?
+  notes           String?
+  
+  createdAt       DateTime @default(now())
+
+  @@map("reservoir_checks")
+}
+
+model IrrigationCheck {
+  id                String           @id @default(uuid())
+  walkthroughId     String
+  walkthrough       DailyWalkthrough @relation(fields: [walkthroughId], references: [id], onDelete: Cascade)
+  
+  zoneName          String // "Veg Upstairs", "Veg Downstairs", "Flower Upstairs", "Flower Downstairs"
+  drippersTotal     Int
+  drippersWorking   Int
+  drippersFailed    String? // JSON array of failed dripper IDs
+  waterFlow         Boolean
+  nutrientsMixed    Boolean
+  scheduleActive    Boolean
+  photoUrl          String? // Photo of working system
+  issues            String?
+  
+  createdAt         DateTime @default(now())
+
+  @@map("irrigation_checks")
+}
+
+model PlantHealthCheck {
+  id                String           @id @default(uuid())
+  walkthroughId     String
+  walkthrough       DailyWalkthrough @relation(fields: [walkthroughId], references: [id], onDelete: Cascade)
+  
+  zoneName          String
+  healthStatus      HealthStatus
+  pestsObserved     Boolean
+  pestType          String?
+  waterAccess       AccessStatus
+  foodAccess        AccessStatus
+  flaggedForAttention Boolean        @default(false)
+  issuePhotoUrl     String?
+  referencePhotoUrl String? // Photo of healthy system
+  notes             String?
+  
+  createdAt         DateTime @default(now())
+
+  @@map("plant_health_checks")
+}