Improve virtual phone number generation and link communication apps

Update virtual SIM provisioning to use a more robust number generation scheme and synchronize phone and messaging app identities.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 90a58ebe-9d8a-4efa-8f4a-d7ae87fb7468
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communication_sync.md

@@ -0,0 +1,14 @@
+# Phone and Messages Synchronization
+
+The Phone and Messages apps have been unified to use a single virtual phone number per user.
+
+## Synchronization Logic
+- **Single Source of Truth**: The `lun_numbers` table is now the primary source for a user's phone identity.
+- **Bi-directional Linking**:
+  - If a user creates a number in the **Phone** app, it is automatically assigned to their primary **Virtual SIM** used by Messages.
+  - If a user provisions a **Virtual SIM** in the **Messages** app, it automatically creates the corresponding **LunNumber** record for the Phone app.
+- **Persistence**: Numbers are tied to the `user_id`, ensuring they remain identical across logins and across all communication apps.
+
+## Database Tables
+- `lun_numbers`: Stores the official identity number for the user.
+- `virtual_sims`: Stores the SIM card details, with the `lun_number` field synchronized to the `lun_numbers` table.

routes.py

@@ -5897,12 +5897,16 @@ def create_virtual_sim():
         sim_id = f"lunsim_{random.randint(10000, 99999)}"
     
     # If a Lun number exists, use it for the primary SIM
-    if lun_num_record and existing_count == 0:
+    if lun_num_record:
         lun_number = lun_num_record.lun_number
     else:
-        lun_number = f"700{random.randint(1000000, 9999999)}"
+        prefix = '7001'
+        suffix = ''.join([str(secrets.randbelow(10)) for _ in range(6)])
+        lun_number = f"{prefix}{suffix}"
+        
         while VirtualSIM.query.filter_by(lun_number=lun_number).first() or LunNumber.query.filter_by(lun_number=lun_number).first():
-            lun_number = f"700{random.randint(1000000, 9999999)}"
+            suffix = ''.join([str(secrets.randbelow(10)) for _ in range(6)])
+            lun_number = f"{prefix}{suffix}"
     
     is_primary = existing_count == 0