Manufacturing & Control SCADA Data Summary Agent

import pandas as pd
from datetime import datetime, timedelta

def query_historian(tags, start, end):
    data = {}
    for tag in tags:
        data[tag] = pd.Series(...)  # simulated
    return data

def summarize_tag(series):
    return {
        'avg': series.mean(),
        'min': series.min(),
        'max': series.max(),
        'trend': 'up' if series.iloc[-1] > series.iloc[0] else 'down'
    }

def summarize_alarms(alarm_log):
    return pd.DataFrame(alarm_log).groupby('severity').size()

# Generate SCADA summary report