fix(scheduling): reject stale invitation actions

src/govoplan_scheduling/backend/schemas.py

@@ -523,6 +523,31 @@ class SchedulingInvitationActionRequest(BaseModel):
     model_config = ConfigDict(extra="forbid")
 
     action: Literal["copy", "send"]
+    participant_revision: str = Field(
+        min_length=64,
+        max_length=64,
+        pattern=r"^[0-9a-f]{64}$",
+        description=(
+            "Semantic revision from the participant management projection; "
+            "stale actions are rejected before rotating or delivering a link."
+        ),
+    )
+
+
+class SchedulingInvitationRevokeRequest(BaseModel):
+    """Revoke the link represented by one current participant projection."""
+
+    model_config = ConfigDict(extra="forbid")
+
+    participant_revision: str = Field(
+        min_length=64,
+        max_length=64,
+        pattern=r"^[0-9a-f]{64}$",
+        description=(
+            "Semantic revision from the participant management projection; "
+            "stale revocations are rejected before changing access."
+        ),
+    )
 
 
 class SchedulingInvitationActionResponse(BaseModel):