commit 1ce40ced7ec06cdf435af7a2f4204222df7c9cde
Author: Mika <kontakt@donau2space.de>
Date:   Mon Feb 16 15:27:08 2026 +0000

    Add mess_log_processing/src/mess_log_processing/core.py

diff --git a/mess_log_processing/src/mess_log_processing/core.py b/mess_log_processing/src/mess_log_processing/core.py
new file mode 100644
index 0000000..752fe91
--- /dev/null
+++ b/mess_log_processing/src/mess_log_processing/core.py
@@ -0,0 +1,118 @@
+from __future__ import annotations
+import json
+import pandas as pd
+import logging
+from pathlib import Path
+from dataclasses import dataclass
+from typing import Any, List
+
+
+# Configure module-level logger
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.INFO)
+
+
+@dataclass
+class LogData:
+    """Data model representing a single measurement log entry."""
+    t_publish: float
+    t_gate_read: float
+    t_index_visible: float
+    pinned_flag: bool
+    timeouts: int
+    drift_signature: str
+
+    @classmethod
+    def from_dict(cls, data: dict[str, Any]) -> LogData:
+        required_fields = {f.name for f in cls.__dataclass_fields__.values()}
+        missing = required_fields - data.keys()
+        if missing:
+            raise ValueError(f"Missing fields {missing} in LogData input")
+        return cls(
+            t_publish=float(data["t_publish"]),
+            t_gate_read=float(data["t_gate_read"]),
+            t_index_visible=float(data["t_index_visible"]),
+            pinned_flag=bool(data["pinned_flag"]),
+            timeouts=int(data["timeouts"]),
+            drift_signature=str(data["drift_signature"]),
+        )
+
+
+def process_logs(json_file: str, csv_file: str) -> pd.DataFrame:
+    """Reads JSONL and CSV measurement logs, merges them, and computes aggregated statistics.
+
+    Args:
+        json_file (str): Path to JSONL log file with raw measurements.
+        csv_file (str): Path to CSV overview file.
+
+    Returns:
+        pd.DataFrame: Aggregated statistics with p50, p95, p99, and max per stratum.
+    """
+    json_path = Path(json_file)
+    csv_path = Path(csv_file)
+
+    if not json_path.exists():
+        raise FileNotFoundError(f"JSON log file not found: {json_file}")
+    if not csv_path.exists():
+        raise FileNotFoundError(f"CSV file not found: {csv_file}")
+
+    logger.info("Reading JSONL log file: %s", json_file)
+    json_records: List[dict[str, Any]] = []
+    with open(json_path, 'r', encoding='utf-8') as f:
+        for line_no, line in enumerate(f, start=1):
+            if not line.strip():
+                continue
+            try:
+                record_raw = json.loads(line)
+                record = LogData.from_dict(record_raw)
+                json_records.append(record.__dict__)
+            except Exception as e:
+                logger.warning("Skipping invalid JSON line %d: %s", line_no, e)
+
+    logger.info("Reading CSV summary file: %s", csv_file)
+    csv_df = pd.read_csv(csv_path)
+
+    # Validate CSV fields
+    expected_cols = {f.name for f in LogData.__dataclass_fields__.values()}
+    missing_cols = expected_cols - set(csv_df.columns)
+    if missing_cols:
+        raise ValueError(f"CSV file is missing required columns: {missing_cols}")
+
+    json_df = pd.DataFrame(json_records)
+    combined_df = pd.concat([json_df, csv_df], ignore_index=True)
+
+    logger.info("Computing latency metrics and aggregations")
+    combined_df['latency_publish_gate'] = combined_df['t_gate_read'] - combined_df['t_publish']
+    combined_df['latency_gate_index'] = combined_df['t_index_visible'] - combined_df['t_gate_read']
+
+    def _aggregate(group: pd.DataFrame) -> pd.Series:
+        def _quantiles(series: pd.Series) -> dict[str, float]:
+            return {
+                'p50': series.quantile(0.5),
+                'p95': series.quantile(0.95),
+                'p99': series.quantile(0.99),
+                'max': series.max(),
+            }
+
+        pub_gate = _quantiles(group['latency_publish_gate'])
+        gate_index = _quantiles(group['latency_gate_index'])
+
+        return pd.Series({
+            'publish_gate_p50': pub_gate['p50'],
+            'publish_gate_p95': pub_gate['p95'],
+            'publish_gate_p99': pub_gate['p99'],
+            'publish_gate_max': pub_gate['max'],
+            'gate_index_p50': gate_index['p50'],
+            'gate_index_p95': gate_index['p95'],
+            'gate_index_p99': gate_index['p99'],
+            'gate_index_max': gate_index['max'],
+            'timeouts_sum': group['timeouts'].sum(),
+            'record_count': len(group)
+        })
+
+    aggregated_df = combined_df.groupby('pinned_flag', as_index=False).apply(_aggregate)
+
+    assert not aggregated_df.empty, "Aggregated DataFrame should not be empty"
+
+    logger.info("Aggregation complete. Rows: %d", len(aggregated_df))
+    return aggregated_df.reset_index(drop=True)