[verified] feat: support monthly completion recurrence

backend/schemas.py

@@ -125,6 +125,7 @@ class TaskCreate(BaseModel):
     rrule: str | None = Field(default=None, min_length=5, max_length=1000)
     trigger_mode: str | None = Field(default=None, pattern="^(scheduled|after_completion)$")
     after_completion_days: int | None = Field(default=None, ge=1, le=3650)
+    after_completion_unit: str | None = Field(default=None, pattern="^(days|months)$")
 
     @field_validator("title")
     @classmethod
@@ -136,7 +137,12 @@ class TaskCreate(BaseModel):
 
     @model_validator(mode="after")
     def validate_recurrence(self):
-        has_recurrence = self.rrule is not None or self.trigger_mode is not None or self.after_completion_days is not None
+        has_recurrence = (
+            self.rrule is not None
+            or self.trigger_mode is not None
+            or self.after_completion_days is not None
+            or self.after_completion_unit is not None
+        )
         if has_recurrence and self.due_at is None:
             raise ValueError("recurrence requires due_at")
         if has_recurrence and self.parent_id is not None:
@@ -144,10 +150,15 @@ class TaskCreate(BaseModel):
         if self.trigger_mode == "after_completion":
             if self.after_completion_days is None or self.rrule is not None:
                 raise ValueError("after_completion requires days and no rrule")
-        elif self.trigger_mode == "scheduled" and self.rrule is None:
-            raise ValueError("scheduled recurrence requires rrule")
-        elif self.trigger_mode is None and self.after_completion_days is not None:
-            raise ValueError("after_completion_days requires after_completion mode")
+        elif self.trigger_mode == "scheduled":
+            if (
+                self.rrule is None
+                or self.after_completion_days is not None
+                or self.after_completion_unit is not None
+            ):
+                raise ValueError("scheduled recurrence requires rrule and no completion interval")
+        elif self.after_completion_days is not None or self.after_completion_unit is not None:
+            raise ValueError("completion interval requires after_completion mode")
         return self