Feat: add Langfuse APIs (#6460)

### What problem does this PR solve?

Add Langfuse APIs

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/db/db_models.py

@@ -524,9 +524,7 @@ class TenantLangfuse(DataBaseModel):
     tenant_id = CharField(max_length=32, null=False, primary_key=True)
     secret_key = CharField(max_length=2048, null=False, help_text="SECRET KEY", index=True)
     public_key = CharField(max_length=2048, null=False, help_text="PUBLIC KEY", index=True)
-    host = CharField(max_length=128, null=False, help_text="host", index=True)
-    # max_tokens = IntegerField(default=8192, index=True)
-    # used_tokens = IntegerField(default=0, index=True)
+    host = CharField(max_length=128, null=False, help_text="HOST", index=True)
 
     def __str__(self):
         return "Langfuse host" + self.host

api/db/services/langfuse_service.py

@@ -34,13 +34,23 @@ class TenantLangfuseService(CommonService):
     @classmethod
     @DB.connection_context()
     def filter_by_tenant(cls, tenant_id):
-        fields = [cls.model.host, cls.model.secret_key, cls.model.public_key]
+        fields = [cls.model.tenant_id, cls.model.host, cls.model.secret_key, cls.model.public_key]
         try:
             keys = cls.model.select(*fields).where(cls.model.tenant_id == tenant_id).first()
             return keys
         except peewee.DoesNotExist:
             return None
 
+    @classmethod
+    @DB.connection_context()
+    def filter_by_tenant_with_info(cls, tenant_id):
+        fields = [cls.model.tenant_id, cls.model.host, cls.model.secret_key, cls.model.public_key]
+        try:
+            keys = cls.model.select(*fields).where(cls.model.tenant_id == tenant_id).dicts().first()
+            return keys
+        except peewee.DoesNotExist:
+            return None
+
     @classmethod
     def update_by_tenant(cls, tenant_id, langfuse_keys):
         langfuse_keys["update_time"] = current_timestamp()
@@ -55,3 +65,7 @@ class TenantLangfuseService(CommonService):
         kwargs["update_date"] = datetime_format(datetime.now())
         obj = cls.model.create(**kwargs)
         return obj
+
+    @classmethod
+    def delete_model(cls, langfuse_model):
+        langfuse_model.delete_instance()