feat(profiler): track SMTP victim domains per attacker

New SmtpTarget table records each (attacker, domain) pair observed via
the SMTP honeypots. Only the domain is stored — local-parts are dropped
at ingestion, so this table holds no user-identifying data beyond the
target organisation's identity.

The profiler worker extracts domains from rcpt_to / rcpt_denied /
message_accepted events, normalizes them (lowercase, strip local-part,
drop blocked TLDs), and upserts one row per pair with a running count +
first_seen / last_seen.

Three repo methods shipped:
  * increment_smtp_target(attacker, domain) — upsert + bump
  * list_smtp_targets(attacker) — per-attacker view
  * smtp_target_seen(domain) — cross-attacker aggregate, shaped as the
    federation-gossip RPC that V2 will expose.

The gossip-query shape is load-bearing: each operator can answer
"have any of your attackers targeted corp1.com?" without leaking
which attackers or when — the aggregate returns a bool + total count
+ first/last seen, nothing else.

tests/test_base_repo.py

@@ -31,6 +31,9 @@ class DummyRepo(BaseRepository):
     async def get_behaviors_for_ips(self, ips): await super().get_behaviors_for_ips(ips)
     async def upsert_session_profile(self, sid, data): await super().upsert_session_profile(sid, data)
     async def get_session_profile(self, sid): await super().get_session_profile(sid)
+    async def increment_smtp_target(self, u, d): await super().increment_smtp_target(u, d)
+    async def list_smtp_targets(self, u): await super().list_smtp_targets(u)
+    async def smtp_target_seen(self, d): await super().smtp_target_seen(d)
     async def get_attacker_by_uuid(self, u): await super().get_attacker_by_uuid(u)
     async def get_attackers(self, **kw): await super().get_attackers(**kw)
     async def get_total_attackers(self, **kw): await super().get_total_attackers(**kw)
@@ -72,6 +75,9 @@ async def test_base_repo_coverage():
     await dr.get_behaviors_for_ips({"1.1.1.1"})
     await dr.upsert_session_profile("sid", {})
     await dr.get_session_profile("sid")
+    await dr.increment_smtp_target("uuid", "corp.com")
+    await dr.list_smtp_targets("uuid")
+    await dr.smtp_target_seen("corp.com")
     await dr.get_attacker_by_uuid("a")
     await dr.get_attackers()
     await dr.get_total_attackers()

tests/test_smtp_targets.py

@@ -0,0 +1,160 @@
+"""
+Tests for SMTP victim-domain tracking (SmtpTarget table + profiler ingestion).
+
+Two surfaces under test:
+  * Repo upsert / list / aggregate-seen helpers.
+  * The profiler's `_extract_smtp_domains` + `_normalize_smtp_domain`
+    parsers — pure functions exercised directly without running the
+    full worker loop.
+"""
+from datetime import datetime, timezone
+
+import pytest
+
+from decnet.web.db.factory import get_repository
+from decnet.correlation.parser import LogEvent
+from decnet.profiler.worker import _extract_smtp_domains, _normalize_smtp_domain
+
+
+@pytest.fixture
+async def repo(tmp_path):
+    r = get_repository(db_path=str(tmp_path / "smtp_targets.db"))
+    await r.initialize()
+    return r
+
+
+def _smtp_event(event_type: str, **fields) -> LogEvent:
+    return LogEvent(
+        timestamp=datetime.now(timezone.utc),
+        decky="decky-01",
+        service="smtp",
+        event_type=event_type,
+        attacker_ip="1.2.3.4",
+        fields=fields,
+        raw="",
+    )
+
+
+# ── Domain normalization ─────────────────────────────────────────────────────
+
+@pytest.mark.parametrize("raw, expected", [
+    ("<john@corp1.com>",       "corp1.com"),
+    ("JOHN@CORP1.COM",         "corp1.com"),
+    ("<alice@mail.corp.io>",   "mail.corp.io"),
+    # Empty / malformed → None
+    ("",                       None),
+    ("notanemail",             None),
+    ("@nouser.com",            None),
+    ("user@",                  None),
+    # Blocked TLDs
+    ("admin@foo.invalid",      None),
+    ("test@bar.test",          None),
+    ("x@local.example",        None),
+    # Punctuation / angle-bracket forms the RCPT parser already validated
+    ("RCPT TO:<c@d.com>",      "d.com"),
+])
+def test_normalize_smtp_domain(raw, expected):
+    assert _normalize_smtp_domain(raw) == expected
+
+
+# ── Event → domain extraction ────────────────────────────────────────────────
+
+def test_extract_from_rcpt_to():
+    events = [
+        _smtp_event("rcpt_to", value="<bob@target.com>"),
+        _smtp_event("rcpt_to", value="<alice@other.com>"),
+    ]
+    assert _extract_smtp_domains(events) == {"target.com", "other.com"}
+
+
+def test_extract_from_rcpt_denied():
+    events = [_smtp_event("rcpt_denied", value="<carol@corp.net>")]
+    assert _extract_smtp_domains(events) == {"corp.net"}
+
+
+def test_extract_from_message_accepted_splits_recipients():
+    """`message_accepted.rcpt_to` is a comma-joined list, not a single addr."""
+    events = [_smtp_event(
+        "message_accepted",
+        rcpt_to="<a@one.com>,<b@two.com>,<c@one.com>",
+        mail_from="<spam@evil.com>",
+    )]
+    assert _extract_smtp_domains(events) == {"one.com", "two.com"}
+
+
+def test_extract_ignores_non_smtp_events():
+    """Identical `value` fields on non-smtp services must not leak in."""
+    events = [
+        LogEvent(
+            timestamp=datetime.now(timezone.utc),
+            decky="decky-01", service="ssh", event_type="rcpt_to",
+            attacker_ip="1.2.3.4",
+            fields={"value": "<x@wrong.com>"}, raw="",
+        ),
+    ]
+    assert _extract_smtp_domains(events) == set()
+
+
+def test_extract_dedupes_within_batch():
+    events = [
+        _smtp_event("rcpt_to", value="<a@corp.com>"),
+        _smtp_event("rcpt_to", value="<b@corp.com>"),
+        _smtp_event("rcpt_to", value="<c@corp.com>"),
+    ]
+    assert _extract_smtp_domains(events) == {"corp.com"}
+
+
+# ── Repo: increment + list + seen ────────────────────────────────────────────
+
+@pytest.mark.anyio
+async def test_increment_creates_then_bumps(repo):
+    await repo.increment_smtp_target("uuid-1", "corp.com")
+    rows = await repo.list_smtp_targets("uuid-1")
+    assert len(rows) == 1
+    assert rows[0]["domain"] == "corp.com"
+    assert rows[0]["count"] == 1
+    first_seen_1 = rows[0]["first_seen"]
+
+    # Second hit bumps count + last_seen, preserves first_seen.
+    await repo.increment_smtp_target("uuid-1", "corp.com")
+    rows = await repo.list_smtp_targets("uuid-1")
+    assert rows[0]["count"] == 2
+    assert rows[0]["first_seen"] == first_seen_1
+
+
+@pytest.mark.anyio
+async def test_increment_isolates_per_attacker(repo):
+    await repo.increment_smtp_target("uuid-a", "corp.com")
+    await repo.increment_smtp_target("uuid-b", "corp.com")
+    assert len(await repo.list_smtp_targets("uuid-a")) == 1
+    assert len(await repo.list_smtp_targets("uuid-b")) == 1
+
+
+@pytest.mark.anyio
+async def test_list_orders_by_last_seen_desc(repo):
+    await repo.increment_smtp_target("uuid-1", "older.com")
+    await repo.increment_smtp_target("uuid-1", "newer.com")
+    rows = await repo.list_smtp_targets("uuid-1")
+    # Second call (newer.com) has a later last_seen → first row.
+    assert [r["domain"] for r in rows] == ["newer.com", "older.com"]
+
+
+@pytest.mark.anyio
+async def test_smtp_target_seen_aggregates_across_attackers(repo):
+    await repo.increment_smtp_target("uuid-a", "corp.com")
+    await repo.increment_smtp_target("uuid-a", "corp.com")
+    await repo.increment_smtp_target("uuid-b", "corp.com")
+    agg = await repo.smtp_target_seen("corp.com")
+    assert agg["seen"] is True
+    assert agg["count"] == 3  # 2 + 1
+    assert agg["first_seen"] is not None
+    assert agg["last_seen"] is not None
+
+
+@pytest.mark.anyio
+async def test_smtp_target_seen_unknown_domain(repo):
+    agg = await repo.smtp_target_seen("never-targeted.org")
+    assert agg["seen"] is False
+    assert agg["count"] == 0
+    assert agg["first_seen"] is None
+    assert agg["last_seen"] is None