feat: Implement message check-in and status management, introduce flexible interval units, and add decryption routes for messages and attachments.

prisma/schema.prisma

@@ -45,19 +45,20 @@ model User {
 }
 
 model Message {
-  id          String       @id @default(cuid())
-  userId      String
-  title       String
-  content     String?      @db.Text
-  status      String       @default("DRAFT")
-  isEncrypted Boolean      @default(false)
-  lastPing    DateTime     @default(now())
-  checkInterval Int        @default(24)
-  user        User         @relation(fields: [userId], references: [id], onDelete: Cascade)
-  recipients  Recipient[]
-  attachments Attachment[]
-  createdAt   DateTime     @default(now())
-  updatedAt   DateTime     @updatedAt
+  id            String       @id @default(cuid())
+  userId        String
+  title         String
+  content       String?      @db.Text
+  status        String       @default("DRAFT")
+  isEncrypted   Boolean      @default(false)
+  lastPing      DateTime     @default(now())
+  checkInterval Int          @default(24)
+  intervalUnit  String       @default("HOURS")
+  user          User         @relation(fields: [userId], references: [id], onDelete: Cascade)
+  recipients    Recipient[]
+  attachments   Attachment[]
+  createdAt     DateTime     @default(now())
+  updatedAt     DateTime     @updatedAt
 }
 
 model Recipient {