Complete core Appwrite migration with documentation and fixes

Co-authored-by: FranP-code <76450203+FranP-code@users.noreply.github.com>

APPWRITE_MIGRATION.md

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+# Appwrite Migration Progress
+
+## Completed Migrations
+
+### 1. Dependencies
+- ✅ Installed Appwrite SDK v16.0.2
+- ✅ Removed @supabase/supabase-js dependency
+- ✅ Updated package.json
+
+### 2. Core Configuration
+- ✅ Created `src/lib/appwrite.ts` - Main client configuration
+- ✅ Created `src/lib/appwrite-admin.ts` - Server-side admin operations
+- ✅ Updated environment variables in `.env.example`
+
+### 3. Authentication Components
+- ✅ `src/components/AuthForm.tsx` - Migrated to Appwrite Account API
+- ✅ `src/components/AuthGuard.tsx` - Updated session management
+- ✅ `src/components/Navbar.tsx` - Updated user state handling
+
+### 4. Database Operations
+- ✅ `src/components/Dashboard.tsx` - Partially migrated database queries
+- ✅ `src/pages/api/postmark.ts` - Migrated webhook API to use Appwrite
+- ✅ `src/components/DebtCard.tsx` - Migrated debt operations and function calls
+- 🔄 `src/components/Configuration.tsx` - Partially migrated user data fetching
+
+### 5. Function Calls
+- ✅ Updated function invocation from Supabase to Appwrite Functions API
+- ✅ Changed authentication headers from Bearer tokens to X-Appwrite-Project/X-Appwrite-Key
+
+## Required Appwrite Setup
+
+### Environment Variables
+```bash
+PUBLIC_APPWRITE_ENDPOINT=https://cloud.appwrite.io/v1
+PUBLIC_APPWRITE_PROJECT_ID=your_project_id
+PUBLIC_APPWRITE_DATABASE_ID=your_database_id
+APPWRITE_API_KEY=your_api_key
+```
+
+### Database Collections to Create
+1. **debts** - Main debt records
+2. **audit_logs** - Action logging
+3. **user_profiles** - User settings and preferences
+4. **additional_emails** - Secondary email addresses
+5. **email_processing_usage** - Monthly usage tracking
+6. **debt_variables** - Custom debt variables
+7. **conversation_messages** - Email conversation history
+8. **users** - User personal data
+
+### Functions to Migrate
+1. **negotiate** - AI debt negotiation logic
+2. **approve-debt** - Debt approval workflow
+3. **send-email** - Email sending functionality
+4. **analyze-response** - Email response analysis
+5. **test-extraction** - Debt information extraction testing
+
+## Remaining Tasks
+
+### Components Not Yet Migrated
+- `src/components/ConversationTimeline.tsx`
+- `src/components/OnboardingDialog.tsx`
+- `src/components/ManualResponseDialog.tsx`
+- `src/components/DebtTimeline.tsx`
+- `src/components/RealtimeTestButton.tsx`
+- `src/components/ExtractionTester.tsx`
+
+### Migration Notes
+
+#### Authentication
+- Replaced `supabase.auth.signUp()` with `account.create()` + `account.createEmailPasswordSession()`
+- Replaced `supabase.auth.signInWithPassword()` with `account.createEmailPasswordSession()`
+- Replaced `supabase.auth.getUser()` with `account.get()`
+- Replaced `supabase.auth.signOut()` with `account.deleteSession('current')`
+
+#### Database Operations
+- Replaced `supabase.from().select()` with `databases.listDocuments()`
+- Replaced `supabase.from().insert()` with `databases.createDocument()`
+- Replaced `supabase.from().update()` with `databases.updateDocument()`
+- Note: Appwrite queries use different syntax than Supabase filters
+
+#### Function Calls
+- Replaced `supabase.functions.invoke()` with `functions.createExecution()`
+- Changed authentication from Authorization header to X-Appwrite-Project/X-Appwrite-Key headers
+
+#### Real-time Updates
+- Supabase real-time subscriptions need to be replaced with Appwrite real-time
+- Currently using polling as a temporary fallback
+
+## Testing Required
+
+1. **Authentication Flow**
+   - User registration
+   - User login/logout
+   - Session persistence
+
+2. **Database Operations**
+   - Debt creation and updates
+   - User profile management
+   - Audit logging
+
+3. **Function Execution**
+   - Email sending
+   - AI negotiation
+   - Response analysis
+
+4. **API Endpoints**
+   - Postmark webhook processing
+   - Email parsing and storage
+
+## Production Deployment Checklist
+
+1. Set up Appwrite project and database
+2. Create all required collections with proper schemas
+3. Deploy Appwrite Functions (migrated from Supabase Edge Functions)
+4. Configure environment variables
+5. Set up proper permissions and security rules
+6. Test all functionality end-to-end
+7. Migrate data from Supabase to Appwrite
+8. Update DNS/domain configuration if needed