added: profiling toolchain (py-spy, pyinstrument, pytest-benchmark, memray, snakeviz)

New `profile` optional-deps group, opt-in Pyinstrument ASGI middleware
gated by DECNET_PROFILE_REQUESTS, bench marker + tests/perf/ micro-benchmarks
for repository hot paths, and scripts/profile/ helpers for py-spy/cProfile/memray.

tests/perf/test_repo_bench.py

@@ -0,0 +1,60 @@
+"""
+Micro-benchmarks for the repository hot paths.
+
+Run with:
+    pytest -m bench tests/perf/
+
+These do NOT run in the default suite (see `addopts` in pyproject.toml).
+"""
+import pytest
+
+
+pytestmark = pytest.mark.bench
+
+
+def test_add_log_bench(benchmark, repo, event_loop):
+    payload = {
+        "decky": "decky-bench",
+        "service": "ssh",
+        "event_type": "connect",
+        "attacker_ip": "10.0.0.1",
+        "raw_line": "bench event",
+        "fields": "{}",
+        "msg": "",
+    }
+
+    def run():
+        event_loop.run_until_complete(repo.add_log(payload))
+
+    benchmark(run)
+
+
+def test_get_logs_bench(benchmark, seeded_repo, event_loop):
+    def run():
+        return event_loop.run_until_complete(seeded_repo.get_logs(limit=50, offset=0))
+
+    result = benchmark(run)
+    assert len(result) == 50
+
+
+def test_get_total_logs_bench(benchmark, seeded_repo, event_loop):
+    def run():
+        return event_loop.run_until_complete(seeded_repo.get_total_logs())
+
+    benchmark(run)
+
+
+def test_get_logs_search_bench(benchmark, seeded_repo, event_loop):
+    def run():
+        return event_loop.run_until_complete(
+            seeded_repo.get_logs(limit=50, offset=0, search="service:ssh")
+        )
+
+    benchmark(run)
+
+
+def test_get_user_by_username_bench(benchmark, seeded_repo, event_loop):
+    def run():
+        return event_loop.run_until_complete(seeded_repo.get_user_by_username("admin"))
+
+    benchmark(run)