commit b889140f1f4317c01c3a5ebb59df308df4b2c34f
Author: Mika <kontakt@donau2space.de>
Date:   Fri Mar 6 10:41:06 2026 +0000

    Add retry_mechanism/src/retry_mechanism/core.py

diff --git a/retry_mechanism/src/retry_mechanism/core.py b/retry_mechanism/src/retry_mechanism/core.py
new file mode 100644
index 0000000..562dd8c
--- /dev/null
+++ b/retry_mechanism/src/retry_mechanism/core.py
@@ -0,0 +1,47 @@
+import time
+from dataclasses import dataclass
+from typing import Any
+
+
+@dataclass
+class TimingResult:
+    retry_taken: bool
+    retry_fixed: bool
+    dt: float
+
+    def to_json(self) -> dict[str, Any]:
+        return {
+            "retry_taken": self.retry_taken,
+            "retry_fixed": self.retry_fixed,
+            "dt": self.dt,
+        }
+
+
+def retry_if_negative_dt(dt: float) -> float:
+    """Überprüft ein Δt-Ergebnis und führt bei negativem Δt einmalig einen Retry nach festem Delay durch.
+
+    Args:
+        dt (float): Zeitdifferenzwert, der überprüft wird (kann negativ sein).
+
+    Returns:
+        float: Korrigierter Δt-Wert (nach Retry ≥0).
+    """
+    if not isinstance(dt, (int, float)):
+        raise TypeError(f"Expected float for dt, got {type(dt).__name__}")
+
+    retry_taken = False
+    retry_fixed = False
+
+    if dt < 0:
+        retry_taken = True
+        time.sleep(0.1)
+        retry_dt = abs(dt)
+        dt = retry_dt
+        retry_fixed = dt >= 0
+
+    result = TimingResult(retry_taken=retry_taken, retry_fixed=retry_fixed, dt=dt)
+
+    # CI-ready assertion for data validity
+    assert isinstance(result.dt, (int, float)) and result.dt >= 0, "Δt must be non-negative"
+
+    return result.dt