app/engine/json_utils.py

# analytics-service/app/engine/json_utils.py
import json
from datetime import datetime, date
import numpy as np

class CustomJSONEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, (datetime, date)):
            return obj.isoformat()
        if isinstance(obj, (np.integer, np.int64)):
            return int(obj)
        if isinstance(obj, (np.floating, np.float64)):
            return float(obj)
        if isinstance(obj, np.ndarray):
            return obj.tolist()
        return super().default(obj)