commit 4b8fe96731a60c2b6a8d699043644aedf8dbfb22
Author: Mika <kontakt@donau2space.de>
Date:   Sun Mar 15 12:31:22 2026 +0000

    Add artifact1/src/artifact1/core.py

diff --git a/artifact1/src/artifact1/core.py b/artifact1/src/artifact1/core.py
new file mode 100644
index 0000000..03697ab
--- /dev/null
+++ b/artifact1/src/artifact1/core.py
@@ -0,0 +1,101 @@
+from __future__ import annotations
+
+import pandas as pd
+import logging
+from dataclasses import dataclass
+from typing import Any, Dict
+from statistics import mean, stdev
+
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.INFO)
+
+
+class MetricsValidationError(Exception):
+    """Custom Exception for invalid performance metrics input data."""
+    pass
+
+
+@dataclass
+class PerformanceData:
+    max_only_alerts: int
+    outlier_frequency: float
+    expires_at_dist_hours: float
+    retry_total_overhead: float
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> PerformanceData:
+        required_fields = {
+            'max_only_alerts': int,
+            'outlier_frequency': float,
+            'expires_at_dist_hours': float,
+            'retry_total_overhead': float,
+        }
+        for field, t in required_fields.items():
+            if field not in data:
+                raise MetricsValidationError(f"Missing required field: {field}")
+            try:
+                _ = t(data[field])
+            except (ValueError, TypeError):
+                raise MetricsValidationError(f"Invalid type for field {field}: expected {t.__name__}, got {type(data[field]).__name__}")
+        return cls(**{f: data[f] for f in required_fields})
+
+
+def analyze_metrics(data: Dict[str, Any]) -> Dict[str, Any]:
+    """Analysiert Performance-Daten und erstellt aggregierte Analyse-Ergebnisse.
+
+    Args:
+        data: Eingehende JSON-Daten, die Performance-Metriken enthalten.
+    Returns:
+        Dict mit durchschnittlichen und statistischen Kennzahlen.
+    """
+    if not isinstance(data, dict):
+        raise MetricsValidationError("Input data must be a dictionary.")
+
+    metrics = data.get('runs') or data.get('metrics') or data
+
+    if not isinstance(metrics, list):
+        raise MetricsValidationError("Expected a list of metric entries under 'runs' or 'metrics'.")
+
+    try:
+        validated_records = [PerformanceData.from_dict(entry).__dict__ for entry in metrics]
+    except MetricsValidationError as e:
+        logger.error(f"Failed to validate input data: {e}")
+        raise
+
+    if not validated_records:
+        return {'status': 'empty', 'aggregates': {}, 'anomalies': []}
+
+    df = pd.DataFrame(validated_records)
+
+    result: Dict[str, Any] = {'status': 'ok', 'aggregates': {}, 'anomalies': []}
+
+    for column in df.columns:
+        col_data = df[column].dropna()
+        if not col_data.empty:
+            result['aggregates'][column] = {
+                'mean': float(col_data.mean()),
+                'std': float(col_data.std(ddof=0)),
+                'min': float(col_data.min()),
+                'max': float(col_data.max()),
+            }
+
+    anomalies = []
+    for col, stats in result['aggregates'].items():
+        mu, sigma = stats['mean'], stats['std']
+        upper_limit = mu + 3 * sigma if sigma > 0 else mu * 1.3
+        lower_limit = mu - 3 * sigma if sigma > 0 else mu * 0.7
+        outliers = df[(df[col] > upper_limit) | (df[col] < lower_limit)]
+        if not outliers.empty:
+            anomalies.append({
+                'metric': col,
+                'count': int(len(outliers)),
+                'thresholds': {
+                    'lower': lower_limit,
+                    'upper': upper_limit
+                }
+            })
+
+    result['anomalies'] = anomalies
+
+    assert 'aggregates' in result and isinstance(result['aggregates'], dict), "Aggregates missing in result"
+    return result