diff --git a/app/timetracking/backend/models.py b/app/timetracking/backend/models.py
index a283b6a..15285ad 100644
--- a/app/timetracking/backend/models.py
+++ b/app/timetracking/backend/models.py
@@ -30,6 +30,12 @@ class TModuleCustomerCreate(TModuleCustomerBase):
     vtiger_data: Optional[dict] = Field(default_factory=dict)
 
 
+class TModuleBulkRateUpdate(BaseModel):
+    """Model for bulk customer hourly rate update"""
+    customer_ids: List[int] = Field(..., min_length=1, description="List of customer IDs to update")
+    hourly_rate: Decimal = Field(..., ge=0, description="New hourly rate in DKK")
+
+
 class TModuleCustomer(TModuleCustomerBase):
     """Full customer model with DB fields"""
     id: int
diff --git a/app/timetracking/backend/router.py b/app/timetracking/backend/router.py
index 2ce01b6..646d2da 100644
--- a/app/timetracking/backend/router.py
+++ b/app/timetracking/backend/router.py
@@ -26,7 +26,8 @@ from app.timetracking.backend.models import (
     TModuleEconomicExportResult,
     TModuleMetadata,
     TModuleUninstallRequest,
-    TModuleUninstallResult
+    TModuleUninstallResult,
+    TModuleBulkRateUpdate
 )
 from app.timetracking.backend.vtiger_sync import vtiger_service
 from app.timetracking.backend.wizard import wizard
@@ -690,14 +691,13 @@ async def update_customer_hourly_rate(customer_id: int, hourly_rate: float, user
 
 @router.post("/customers/bulk-update-rate", tags=["Customers"])
 async def bulk_update_customer_hourly_rates(
-    customer_ids: List[int],
-    hourly_rate: float,
+    request: TModuleBulkRateUpdate,
     user_id: Optional[int] = None
 ):
     """
     Opdater timepris for flere kunder på én gang.
     
-    Args:
+    Request body:
         customer_ids: Liste af kunde-ID'er
         hourly_rate: Ny timepris i DKK (f.eks. 850.00)
     
@@ -705,16 +705,9 @@ async def bulk_update_customer_hourly_rates(
         Antal opdaterede kunder
     """
     try:
-        from decimal import Decimal
-        
-        # Validate inputs
-        if not customer_ids:
-            raise HTTPException(status_code=400, detail="No customers selected")
-        
-        if hourly_rate < 0:
-            raise HTTPException(status_code=400, detail="Hourly rate must be positive")
-        
-        rate_decimal = Decimal(str(hourly_rate))
+        # Validate inputs (already validated by Pydantic)
+        customer_ids = request.customer_ids
+        rate_decimal = request.hourly_rate
         
         # Update all selected customers
         execute_update(
@@ -731,15 +724,15 @@ async def bulk_update_customer_hourly_rates(
                 entity_type="customer",
                 entity_id=str(customer_id),
                 event_type="hourly_rate_updated",
-                details={"hourly_rate": float(hourly_rate), "bulk_update": True},
+                details={"hourly_rate": float(rate_decimal), "bulk_update": True},
                 user_id=user_id
             )
         
-        logger.info(f"✅ Bulk updated hourly rate for {updated_count} customers to {hourly_rate} DKK")
+        logger.info(f"✅ Bulk updated hourly rate for {updated_count} customers to {rate_decimal} DKK")
         
         return {
             "updated": updated_count,
-            "hourly_rate": float(hourly_rate)
+            "hourly_rate": float(rate_decimal)
         }
         
     except HTTPException:
diff --git a/migrations/051_add_customer_event_types.sql b/migrations/051_add_customer_event_types.sql
new file mode 100644
index 0000000..70f35ff
--- /dev/null
+++ b/migrations/051_add_customer_event_types.sql
@@ -0,0 +1,16 @@
+-- Migration: Add customer-related event types to tmodule_sync_log
+-- Version: v1.3.52
+-- Description: Add 'hourly_rate_updated' and 'time_card_toggled' event types
+
+-- Drop existing constraint
+ALTER TABLE tmodule_sync_log DROP CONSTRAINT IF EXISTS check_event_type;
+
+-- Add new constraint with additional event types
+ALTER TABLE tmodule_sync_log ADD CONSTRAINT check_event_type CHECK (event_type IN (
+    'sync_started', 'sync_completed', 'sync_failed',
+    'approval', 'rejection', 'bulk_approval',
+    'order_created', 'order_updated', 'order_cancelled',
+    'export_started', 'export_completed', 'export_failed',
+    'module_installed', 'module_uninstalled',
+    'hourly_rate_updated', 'time_card_toggled'
+));