Notification updates

backend/src/features/notifications/migrations/001_create_notifications_tables.sql

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+-- email_templates: Admin-editable predefined templates
+CREATE TABLE email_templates (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  template_key VARCHAR(50) NOT NULL UNIQUE CHECK (template_key IN (
+    'maintenance_due_soon', 'maintenance_overdue',
+    'document_expiring', 'document_expired'
+  )),
+  name VARCHAR(100) NOT NULL,
+  description TEXT,
+  subject VARCHAR(255) NOT NULL,
+  body TEXT NOT NULL,
+  variables JSONB DEFAULT '[]'::jsonb,
+  is_active BOOLEAN DEFAULT true,
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+-- notification_logs: Track sent notifications
+CREATE TABLE notification_logs (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  user_id VARCHAR(255) NOT NULL,
+  notification_type VARCHAR(20) NOT NULL CHECK (notification_type IN ('email', 'toast')),
+  template_key VARCHAR(50) NOT NULL,
+  recipient_email VARCHAR(255),
+  subject VARCHAR(255),
+  reference_type VARCHAR(50),  -- 'maintenance_schedule' or 'document'
+  reference_id UUID,
+  status VARCHAR(20) DEFAULT 'sent' CHECK (status IN ('pending', 'sent', 'failed')),
+  error_message TEXT,
+  sent_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Indexes
+CREATE INDEX idx_notification_logs_user_id ON notification_logs(user_id);
+CREATE INDEX idx_notification_logs_reference ON notification_logs(reference_type, reference_id);
+CREATE INDEX idx_notification_logs_sent_at ON notification_logs(sent_at DESC);
+
+-- Seed 4 default templates
+INSERT INTO email_templates (template_key, name, description, subject, body, variables) VALUES
+  ('maintenance_due_soon', 'Maintenance Due Soon', 'Sent when maintenance is due within 30 days or 500 miles',
+   'MotoVaultPro: Maintenance Due Soon for {{vehicleName}}',
+   'Hi {{userName}},
+
+Your {{category}} maintenance for {{vehicleName}} is due soon.
+
+Due Date: {{dueDate}}
+Due Mileage: {{dueMileage}} miles
+Items: {{subtypes}}
+
+Best regards,
+MotoVaultPro',
+   '["userName", "vehicleName", "category", "subtypes", "dueDate", "dueMileage"]'),
+  ('maintenance_overdue', 'Maintenance Overdue', 'Sent when maintenance is past due',
+   'MotoVaultPro: OVERDUE Maintenance for {{vehicleName}}',
+   'Hi {{userName}},
+
+Your {{category}} maintenance for {{vehicleName}} is OVERDUE.
+
+Was Due: {{dueDate}}
+Was Due At: {{dueMileage}} miles
+Items: {{subtypes}}
+
+Please schedule service as soon as possible.
+
+Best regards,
+MotoVaultPro',
+   '["userName", "vehicleName", "category", "subtypes", "dueDate", "dueMileage"]'),
+  ('document_expiring', 'Document Expiring Soon', 'Sent when document expires within 30 days',
+   'MotoVaultPro: {{documentTitle}} Expiring Soon',
+   'Hi {{userName}},
+
+Your {{documentType}} document "{{documentTitle}}" for {{vehicleName}} is expiring soon.
+
+Expiration Date: {{expirationDate}}
+
+Please renew before expiration.
+
+Best regards,
+MotoVaultPro',
+   '["userName", "vehicleName", "documentType", "documentTitle", "expirationDate"]'),
+  ('document_expired', 'Document Expired', 'Sent when document has expired',
+   'MotoVaultPro: {{documentTitle}} Has EXPIRED',
+   'Hi {{userName}},
+
+Your {{documentType}} document "{{documentTitle}}" for {{vehicleName}} has EXPIRED.
+
+Expired On: {{expirationDate}}
+
+Please renew immediately.
+
+Best regards,
+MotoVaultPro',
+   '["userName", "vehicleName", "documentType", "documentTitle", "expirationDate"]');

backend/src/features/notifications/migrations/002_add_email_notifications_columns.sql

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+ALTER TABLE maintenance_schedules ADD COLUMN email_notifications BOOLEAN DEFAULT false;
+ALTER TABLE documents ADD COLUMN email_notifications BOOLEAN DEFAULT false;
+
+CREATE INDEX idx_maintenance_schedules_email_notifications
+  ON maintenance_schedules(email_notifications) WHERE email_notifications = true AND is_active = true;
+CREATE INDEX idx_documents_email_notifications
+  ON documents(email_notifications) WHERE email_notifications = true AND deleted_at IS NULL;