diff --git a/apps/api/src/repositories/interfaces.py b/apps/api/src/repositories/interfaces.py
index d79675c0..1a5c920b 100644
--- a/apps/api/src/repositories/interfaces.py
+++ b/apps/api/src/repositories/interfaces.py
@@ -34,8 +34,19 @@ class IApprovalRepository(Protocol):
     實作: ApprovalDBRepository (PostgreSQL)
     """
 
-    async def create(self, request: ApprovalRequestCreate) -> ApprovalRequest:
-        """建立新的 Approval"""
+    async def create(self, data: dict) -> ApprovalRequest:
+        """
+        建立新的 Approval
+
+        Phase 22 P2: 簽名修正為 dict (與實作一致)
+        2026-03-31 Claude Code (首席架構師 P2 修復)
+
+        Args:
+            data: ApprovalRecord 建立資料 dict
+
+        Returns:
+            ApprovalRequest
+        """
         ...
 
     async def get_by_id(self, approval_id: UUID) -> ApprovalRequest | None:
@@ -65,6 +76,30 @@ class IApprovalRepository(Protocol):
         """新增簽核"""
         ...
 
+    async def find_by_fingerprint(
+        self,
+        fingerprint: str,
+    ) -> ApprovalRequest | None:
+        """
+        根據指紋查找 Approval (告警收斂用)
+
+        Phase 22 P2: 補齊缺失 Protocol 方法
+        2026-03-31 Claude Code (首席架構師 P2 修復)
+        """
+        ...
+
+    async def increment_hit_count(
+        self,
+        approval_id: UUID,
+    ) -> ApprovalRequest | None:
+        """
+        增加 hit_count (告警收斂用)
+
+        Phase 22 P2: 補齊缺失 Protocol 方法
+        2026-03-31 Claude Code (首席架構師 P2 修復)
+        """
+        ...
+
 
 @runtime_checkable
 class IIncidentRepository(Protocol):