Use monotonic time for provider cache expiry

openbb_platform/core/openbb_core/provider/utils/lru.py

@@ -32,7 +32,7 @@ def wrapped(*args, **kwargs) -> Any:
 
 
 def _ttl_hash_gen(seconds: int):
-    start_time = time.time()
+    start_time = time.monotonic()
 
     while True:
-        yield floor((time.time() - start_time) / seconds)
+        yield floor((time.monotonic() - start_time) / seconds)

openbb_platform/core/tests/provider/utils/test_monotonic_cache_expiry.py

@@ -0,0 +1,25 @@
+"""TTL expiry must be independent of wall-clock adjustments."""
+
+from openbb_core.provider.utils import lru
+
+
+def test_clock_correction_cannot_revive_older_cache(monkeypatch):
+    wall = [1000.0]
+    elapsed = [100.0]
+    monkeypatch.setattr(lru.time, "time", lambda: wall[0])
+    monkeypatch.setattr(lru.time, "monotonic", lambda: elapsed[0])
+    calls = []
+
+    @lru.ttl_cache(ttl=10)
+    def fetch():
+        calls.append(len(calls) + 1)
+        return calls[-1]
+
+    assert fetch() == 1
+    wall[0] += 11
+    elapsed[0] += 11
+    assert fetch() == 2
+    wall[0] -= 11
+    elapsed[0] += 1
+    assert fetch() == 2
+    assert calls == [1, 2]