added encryption

backend/MIGRATION_GUIDE.md

@@ -92,6 +92,7 @@ python scripts/migrate_data.py
 **Script Output:**
 
 The script will:
+
 1. Report duplicate users found
 2. Map old duplicate user IDs to the canonical (oldest) user
 3. Update all entries to reference the canonical user
@@ -292,6 +293,7 @@ npm run dev  # or your dev command
 ```
 
 Test the full application:
+
 - Login via Google
 - Create an entry
 - View entries in history
@@ -320,6 +322,7 @@ This will revert the database to its pre-migration state.
 
 **Cause:** Some entries still have string userId references.  
 **Fix:** Re-run the migration script:
+
 ```bash
 python backend/scripts/migrate_data.py
 ```
@@ -328,6 +331,7 @@ python backend/scripts/migrate_data.py
 
 **Cause:** userId is still a string in old entries.  
 **Fix:** Check the entry structure:
+
 ```bash
 mongosh --db grateful_journal
 db.entries.findOne()  # Check userId type
@@ -339,6 +343,7 @@ If userId is a string, run migration again.
 
 **Cause:** Index creation failed due to duplicate emails.  
 **Fix:** The migration script handles this, but if you hit this:
+
 ```bash
 # Rerun migration
 python scripts/migrate_data.py