test(db): cover BaseRepository.update_identity_fingerprints

DummyRepo couldn't instantiate — TLS-cert fingerprint rollup added a new
abstract method without a stub here. Add the override and a call site so
the abstract pass body is hit.

tests/db/test_base_repo.py

@@ -71,6 +71,8 @@ class DummyRepo(BaseRepository):
     async def set_attacker_identity_id(self, a, i): await super().set_attacker_identity_id(a, i)
     async def list_all_identities(self): await super().list_all_identities(); return []
     async def update_identity_merged_into(self, u, w): await super().update_identity_merged_into(u, w)
+    async def update_identity_fingerprints(self, u, *, ja3_hashes=None, hassh_hashes=None, tls_cert_sha256=None):
+        await super().update_identity_fingerprints(u, ja3_hashes=ja3_hashes, hassh_hashes=hassh_hashes, tls_cert_sha256=tls_cert_sha256)
     # Campaign clustering (this PR)
     async def get_campaign_by_uuid(self, u): await super().get_campaign_by_uuid(u)
     async def list_campaigns(self, limit=50, offset=0): await super().list_campaigns(limit, offset); return []
@@ -155,6 +157,7 @@ async def test_base_repo_coverage():
     await dr.list_all_identities()
     await dr.update_identity_merged_into("a", "b")
     await dr.update_identity_merged_into("a", None)
+    await dr.update_identity_fingerprints("a", ja3_hashes='["x"]', hassh_hashes=None, tls_cert_sha256='["y"]')
     await dr.get_campaign_by_uuid("a")
     await dr.list_campaigns()
     await dr.count_campaigns()