32 refine data pipeline training data construction (#37)

* feature: modularized feature engineering for ml setup (new pipeline)

* chore: updating imports properly

* test: updating fixtures with ua and meta

* chore: migrating code ignore groups

* chore: syntax cleaning and code quality

* chore: fixing pipeline data compatability

* Update experiments/procesing/steps/session.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* chore: refactoring and dixing path joining

* chore: refactoring function definition to avoid reinit

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

experiments/procesing/pipelines.py

@@ -2,6 +2,7 @@ from sklearn.pipeline import Pipeline
 import pandas as pd
 from procesing.context import PipelineContext
 from procesing.providers import SupabaseProvider, BackendAPIProvider
+import os
 from procesing.steps import (
     FetchInteractionsStep,
     FetchPriceLogsStep,
@@ -12,11 +13,13 @@ from procesing.steps import (
     ChunkByTimeWindowStep,
     ComputeDemandForChunksStep,
     AggregatePriceLogsStep,
-    # BuildStateSpaceStep,
     FitPricingFunctionStep,
     PredictPricesStep,
     ComputeDemandStep,
-    JoinProductFeaturesStep
+    JoinProductFeaturesStep,
+    ExtractSessionFeaturesStep,
+    JoinLabelsStep,
+    ValidateDataStep,
 )
 from procesing.pricers import SimpleSurgePricer
 
@@ -106,33 +109,64 @@ def full_pipeline(context: PipelineContext,
     return product_features_df, optimal_prices_df
 
 
+def ml_training_pipeline(context: PipelineContext) -> pd.DataFrame:
+    """
+    Build labeled session-level feature matrix for ML model training.
+    Pipeline: fetch -> validate -> extract features -> join labels
+
+    Returns:
+        DataFrame with ~25 features per session + is_agent label
+        Columns: sessionId, experimentId, temporal/behavioral/product/ua features, is_agent
+    """
+    # fetch raw interactions
+    interactions_df = FetchInteractionsStep(context).transform(None)
+
+    # validate data quality (report cached in context)
+    interactions_df = ValidateDataStep(context).transform(interactions_df)
+    if interactions_df.empty:
+        return pd.DataFrame()
+
+    # extract vectorized session features
+    features_df = ExtractSessionFeaturesStep(context).transform(interactions_df)
+    if features_df.empty:
+        return pd.DataFrame()
+
+    # join experiment labels (is_agent = ~xp_human_only)
+    labeled_df = JoinLabelsStep(context).transform(features_df)
+
+    return labeled_df
+
+
 
 
 if __name__ == '__main__':
 
-    class Provider(SupabaseProvider, BackendAPIProvider):
+    class ExperimentsProvider(SupabaseProvider, BackendAPIProvider):
-        def __init__(self, backend_url: str):
-            SupabaseProvider.__init__(self)
-            BackendAPIProvider.__init__(self, backend_url=backend_url)
-
-
-    class HistoricalProvider(SupabaseProvider, BackendAPIProvider):
         def fetch_kafka_topic(self, topic: str) -> pd.DataFrame:
-            path = "/home/velocitatem/Documents/Projects/PHANTOM/experiments/collected_data/858c61ab-0a7f-4595-ae49-33f4365517b9/"
+            base_path = "/home/velocitatem/Documents/Projects/PHANTOM/experiments/collected_data/" # os.path.join(os.path.dirname(__file__), "collected_data")
-            interactions_file = "messages(2).json"
+            if not os.path.isdir(base_path):
-            prices_file = "messages(3).json"
+                return pd.DataFrame()
 
-            data = pd.read_json(path + (interactions_file if topic == "user-interactions" else prices_file))
+            files = {"user-interactions": "int.json", "price-logs": "price.json"}
-            data = [r['payload'] for r in data['value'].to_list()]
+            file_to_read = files.get(topic, files["user-interactions"])
-            data = pd.DataFrame(data)
+            frames = []
-            return data
 
+            for d in os.listdir(base_path):
+                full_path = os.path.join(base_path, d, file_to_read)
+                if not os.path.isfile(full_path):
+                    continue
+                try:
+                    data = pd.read_json(full_path)
+                    payloads = pd.DataFrame([r['payload'] for r in data['value'].to_list()])
+                    frames.append(payloads)
+                except Exception as e:
+                    print(f"Warning: Could not process {full_path}: {e}")
 
-    # example run
+            return pd.concat(frames, ignore_index=True) if frames else pd.DataFrame()
-    context = PipelineContext(
-        provider=HistoricalProvider(),
-        store_mode='airline',
-    )
 
-    product_features, prices = full_pipeline(context)
+    # demo: run ML training pipeline
-    print(prices.to_string())
+    context = PipelineContext(provider=ExperimentsProvider(), store_mode='hotel')
+    features = ml_training_pipeline(context)
+    print(f"Feature matrix: {features.shape}")
+    print(features.head())
+    print(features.info())

experiments/procesing/steps/__init__.py

@@ -6,7 +6,11 @@ from procesing.steps.chunk import ChunkByTimeWindowStep
 from procesing.steps.demand import ComputeDemandStep, ComputeDemandForChunksStep
 from procesing.steps.elasticity import AggregatePriceLogsStep
 from procesing.steps.pricing import FitPricingFunctionStep, PredictPricesStep
-from procesing.steps.session import ExtractSessionFeaturesStep, _extract_features_for_session
+from procesing.steps.session import (
+    ExtractSessionFeaturesStep, JoinLabelsStep, ValidateDataStep,
+    TemporalFeatureStep, BehavioralFeatureStep, ProductFeatureStep, UserAgentFeatureStep,
+    _extract_features_for_session
+)
 
 __all__ = [
     'BaseContextStep',
@@ -25,5 +29,11 @@ __all__ = [
     'FitPricingFunctionStep',
     'PredictPricesStep',
     'ExtractSessionFeaturesStep',
+    'JoinLabelsStep',
+    'ValidateDataStep',
+    'TemporalFeatureStep',
+    'BehavioralFeatureStep',
+    'ProductFeatureStep',
+    'UserAgentFeatureStep',
     '_extract_features_for_session',
 ]

experiments/procesing/steps/base.py

@@ -1,6 +1,7 @@
 from abc import ABC, abstractmethod
 from sklearn.base import BaseEstimator, TransformerMixin
 from procesing.context import PipelineContext
+from typing import Any
 
 class BaseContextStep(BaseEstimator, TransformerMixin, ABC):
     """
@@ -16,7 +17,7 @@ class BaseContextStep(BaseEstimator, TransformerMixin, ABC):
         return self
 
     @abstractmethod
-    def transform(self, X):
+    def transform(self, X) -> Any:
         """Transform input using context. Must be implemented by subclass."""
         pass
 

experiments/procesing/steps/elasticity.py

@@ -7,12 +7,12 @@ class AggregatePriceLogsStep(BaseContextStep):
     """
     Aggregate price logs into time windows using VECTORIZED operations.
     Input: price_logs_df
-    Output: list of price chunks with [productId, price]
+    Output: DataFrame with columns [productId, price]
     """
 
     def transform(self, price_logs_df: pd.DataFrame):
         if price_logs_df.empty:
-            return []
+            return pd.DataFrame(columns=['productId', 'price'])
 
         df = price_logs_df.copy()
         ts_col = self.context.config.get('ts_col', 'ts')

experiments/procesing/steps/session.py

@@ -1,159 +1,261 @@
 """
-Session feature extraction for S_t component of state space.
+Session feature extraction for ML training pipeline.
-Computes behavioral signals from interaction data already in pipeline.
 """
 import pandas as pd
 import numpy as np
-from typing import Optional, Dict, Any
+import re
-from collections import Counter
+from typing import Dict, Any
 from procesing.steps.base import BaseContextStep
 
-def _extract_features_for_session(session_df: pd.DataFrame, session_timeout_sec: float = 900) -> Dict[str, Any]:
+EVENT_CATS = {
-    """Compute features for single session.
+    'page_view': ['page_view'],
-
+    'item_view': ['view_item_page', 'learn_more_about_item'],
-    Args:
+    'cart_add': ['add_item_to_cart'],
-        session_df: interaction events for this session
+    'purchase': ['purchase', 'checkout_complete'],
-        session_timeout_sec: max gap between events before resetting duration (default 900s = 15min)
+    'hover': ['hover_over_title', 'hover_over_paragraph', 'hover_over_link', 'hover_over_button'],
-    """
+    # 'filter': ['filter', 'search', 'apply_filter'],
-    features = {}
+}
-
+HEADLESS_RE = re.compile(r'HeadlessChrome|Headless|PhantomJS', re.I)
-    # basic counts
+AUTOMATION_RE = re.compile(r'Selenium|Playwright|Puppeteer|WebDriver|chromedriver|geckodriver', re.I)
-    features['total_interactions'] = len(session_df)
+BROWSER_PATTERNS = [('Chrome', r'Chrome/[\d.]+'), ('Firefox', r'Firefox/[\d.]+'),
-
+                    ('Safari', r'Safari/[\d.]+'), ('Edge', r'Edg/[\d.]+')]
-    event_counts = session_df['eventName'].value_counts().to_dict()
-    features['page_views'] = event_counts.get('page_view', 0) + event_counts.get('view_item_page', 0)
-    features['item_views'] = event_counts.get('view_item_page', 0)
-    features['searches'] = event_counts.get('search', 0)
-    features['cart_adds'] = event_counts.get('add_item_to_cart', 0)
-
-    # hover events
-    hover_events = ['hover_over_title', 'hover_over_paragraph', 'hover_over_link', 'hover_over_button']
-    features['hovers'] = sum(event_counts.get(ev, 0) for ev in hover_events)
-
-    # product-level signals
-    product_ids = session_df['productId'].dropna()
-    features['unique_products_viewed'] = product_ids.nunique()
-
-    if len(product_ids) > 0:
-        product_view_counts = Counter(product_ids)
-        features['product_view_depth'] = max(product_view_counts.values())
-    else:
-        features['product_view_depth'] = 0
-
-    # temporal features with session timeout logic
-    if 'ts' in session_df.columns:
-        timestamps = session_df['ts'].sort_values()
-
-        # compute active duration considering timeout gaps
-        if len(timestamps) > 1:
-            time_diffs = timestamps.diff().dropna().dt.total_seconds()
-            # only count gaps shorter than timeout towards active session duration
-            active_diffs = time_diffs[time_diffs <= session_timeout_sec]
-            features['session_duration_sec'] = active_diffs.sum() if len(active_diffs) > 0 else 0.0
-
-            features['avg_time_between_events'] = time_diffs.mean()
-            features['std_time_between_events'] = time_diffs.std()
-        else:
-            features['session_duration_sec'] = 0.0
-            features['avg_time_between_events'] = 0.0
-            features['std_time_between_events'] = 0.0
-
-        if features['session_duration_sec'] > 0:
-            features['interaction_velocity'] = (features['total_interactions'] / features['session_duration_sec']) * 60
-        else:
-            features['interaction_velocity'] = 0.0
-    else:
-        features['session_duration_sec'] = 0.0
-        features['interaction_velocity'] = 0.0
-        features['avg_time_between_events'] = 0.0
-        features['std_time_between_events'] = 0.0
-
-    # cart/conversion signals
-    features['cart_to_view_ratio'] = features['cart_adds'] / features['item_views'] if features['item_views'] > 0 else 0.0
-
-    return features
 
 
-def _apply_to_slice(df: pd.DataFrame) -> pd.DataFrame:
+def _get_browser(s: str) -> str:
-    """Apply feature extraction to sliding window of interactions."""
+    if pd.isna(s): return 'Unknown'
-    # add columns of all features at each step
+    for name, pat in BROWSER_PATTERNS:
-    new_cols = ["total_interactions", "page_views", "item_views", "searches",
+        if re.search(pat, s): return name
-                "cart_adds", "hovers", "unique_products_viewed", "product_view_depth",
+    return 'Other'
-                "session_duration_sec", "interaction_velocity",
-                "avg_time_between_events", "std_time_between_events",
-                "cart_to_view_ratio"]
-    for col in new_cols: df[col] = np.nan
-    for idx in range(1, len(df) + 1):
-        features = _extract_features_for_session(df.iloc[:idx])
-        # fillna kinda meh
-        features = { k: (v if not pd.isna(v) else 0.0) for k, v in features.items() }
-        for col in new_cols:
-            df.at[df.index[idx - 1], col] = features[col]
-        #print(f"Processed {idx}/{len(df)} events for session {df['sessionId'].iloc[0]}")
-    return df
-
-class BuildStateSpaceStep(BaseContextStep):
-    """
-    Build state space representation S_t from session features.
-
-    Input: session_features DataFrame
-    Output: state_space_df DataFrame with S_t vectors
-    """
-
-    def transform(self, rich_dataset: pd.DataFrame) -> pd.DataFrame:
-        # check if features are present
-        required_cols = ["total_interactions", "page_views", "item_views", "searches",
-                         "cart_adds", "hovers", "unique_products_viewed", "product_view_depth",
-                         "session_duration_sec", "interaction_velocity",
-                         "avg_time_between_events", "std_time_between_events",
-                         "cart_to_view_ratio"]
-        if not all(col in rich_dataset.columns for col in required_cols):
-            raise ValueError("Missing required columns for feature extraction.")
-        if rich_dataset.empty:
-            return pd.DataFrame()
 
 
-        # For simplicity, we return as is
+class TemporalFeatureStep(BaseContextStep):
-        return rich_dataset.copy()
+    """Vectorized time-based features: durations, velocities, gaps."""
+
+    def __init__(self, context, timeout_sec: float = 900, velocity_window: str = '5min'):
+        super().__init__(context)
+        self.timeout_sec = timeout_sec
+        self.velocity_window = velocity_window
+
+    def transform(self, X: pd.DataFrame) -> pd.DataFrame:
+        df = X.copy()
+        if df.empty or 'ts' not in df.columns:
+            return pd.DataFrame(columns=pd.Series(['sessionId']))
+
+        df['ts_dt'] = pd.to_datetime(df['ts'])
+        df = df.sort_values(['sessionId', 'ts_dt'])
+        df['time_diff'] = df.groupby('sessionId')['ts_dt'].diff().dt.total_seconds()
+        df['active_diff'] = df['time_diff'].where(df['time_diff'] <= self.timeout_sec, 0)
+
+        agg = df.groupby('sessionId').agg(
+            session_duration_sec=('active_diff', 'sum'),
+            total_interactions=('sessionId', 'count'),
+            avg_time_between_events=('time_diff', 'mean'),
+            std_time_between_events=('time_diff', 'std'),
+            min_time_between_events=('time_diff', 'min'),
+            session_start_hour=('ts_dt', lambda x: x.min().hour),
+        ).reset_index()
+        agg['std_time_between_events'] = agg['std_time_between_events'].fillna(0)
+        agg['interaction_velocity'] = np.where(
+            agg['session_duration_sec'] > 0,
+            (agg['total_interactions'] / agg['session_duration_sec']) * 60, 0)
+
+        vel = df.set_index('ts_dt').groupby('sessionId').resample(self.velocity_window, include_groups=False).size()
+        max_velocity = vel.groupby('sessionId').max().rename('max_velocity_5min')
+        agg = agg.merge(max_velocity, on='sessionId', how='left')
+        agg['max_velocity_5min'] = agg['max_velocity_5min'].fillna(0)
+        return agg
 
 
+class BehavioralFeatureStep(BaseContextStep):
+    """Vectorized event counts and ratios per session."""
+
+    def transform(self, X: pd.DataFrame) -> pd.DataFrame:
+        df = X.copy()
+        if df.empty or 'eventName' not in df.columns:
+            return pd.DataFrame(columns=pd.Series(['sessionId']))
+
+        for cat, events in EVENT_CATS.items():
+            df[f'is_{cat}'] = df['eventName'].isin(events)
+        df['is_hover'] = df['is_hover'] | df['eventName'].str.startswith('hover_over_')
+
+        agg = df.groupby('sessionId').agg(
+            total_events=('eventName', 'count'), unique_pages=('page', 'nunique'),
+            page_views=('is_page_view', 'sum'), item_views=('is_item_view', 'sum'),
+            cart_adds=('is_cart_add', 'sum'), purchases=('is_purchase', 'sum'),
+            hover_events=('is_hover', 'sum'),
+            # filter_events=('is_filter', 'sum'),
+        ).reset_index()
+        agg['cart_to_view_ratio'] = np.where(agg['item_views'] > 0, agg['cart_adds'] / agg['item_views'], 0)
+        agg['conversion_rate'] = np.where(agg['item_views'] > 0, agg['purchases'] / agg['item_views'], 0)
+        agg['hover_intensity'] = np.where(agg['total_events'] > 0, agg['hover_events'] / agg['total_events'], 0)
+        return agg
+
+
+class ProductFeatureStep(BaseContextStep):
+    """Vectorized product interaction features: diversity, depth, price sensitivity."""
+
+    def transform(self, X: pd.DataFrame) -> pd.DataFrame:
+        df = X.copy()
+        if df.empty:
+            return pd.DataFrame(columns=pd.Series(['sessionId']))
+        price_col = next((c for c in ['metadata_base_price', 'metadata_price', 'base_price'] if c in df.columns), None)
+        df['price_seen'] = pd.to_numeric(df[price_col], errors='coerce') if price_col else np.nan
+
+        prod_df = df[df['productId'].notna()]
+        if prod_df.empty:
+            return pd.DataFrame(columns=pd.Series(['sessionId', 'unique_products_viewed', 'product_view_depth', 'avg_price_seen', 'min_price_seen', 'max_price_seen', 'price_range']))
+
+        agg = prod_df.groupby('sessionId').agg(
+            unique_products_viewed=('productId', 'nunique'),
+            product_view_depth=('productId', lambda x: x.value_counts().iloc[0] if len(x) > 0 else 0),
+            avg_price_seen=('price_seen', 'mean'), min_price_seen=('price_seen', 'min'),
+            max_price_seen=('price_seen', 'max'),
+        ).reset_index()
+        agg['price_range'] = (agg['max_price_seen'] - agg['min_price_seen']).fillna(0)
+        return agg
+
+
+class UserAgentFeatureStep(BaseContextStep):
+    """Parse userAgent into bot-detection signals."""
+
+    def transform(self, X: pd.DataFrame) -> pd.DataFrame|pd.Series:
+        df = X.copy()
+        if df.empty or 'userAgent' not in df.columns:
+            return pd.DataFrame(columns=pd.Series(['sessionId']))
+
+        ua = df.groupby('sessionId')['userAgent'].first().reset_index()
+        ua['is_headless'] = ua['userAgent'].str.contains(HEADLESS_RE, na=False)
+        ua['is_automation'] = ua['userAgent'].str.contains(AUTOMATION_RE, na=False)
+        ua['browser_family'] = ua['userAgent'].apply(_get_browser)
+        return ua[['sessionId', 'is_headless', 'is_automation', 'browser_family']]
 
 
 class ExtractSessionFeaturesStep(BaseContextStep):
     """
-    Extract session-level behavioral features from interaction logs.
+    Vectorized session feature extraction - replaces O(n^2) per-row loop.
-
+    Input: interactions_df
-    Input: interactions_df (user-interactions from earlier pipeline step)
+    Output: session-level feature matrix
-    Output: interactions_df with added session feature columns
     """
 
-    def transform(self, interactions_df: pd.DataFrame) -> pd.DataFrame:
+    def transform(self, X: pd.DataFrame) -> pd.DataFrame:
-        if interactions_df.empty:
+        if X.empty:
             return pd.DataFrame()
+        df = X.copy()
 
-        # ensure timestamp column
+        # run all feature steps and merge on sessionId
-        if 'ts' in interactions_df.columns:
+        temporal = TemporalFeatureStep(self.context).transform(df)
-            interactions_df = interactions_df.copy()
+        behavioral = BehavioralFeatureStep(self.context).transform(df)
-            interactions_df['ts'] = pd.to_datetime(interactions_df['ts'])
+        product = ProductFeatureStep(self.context).transform(df)
+        ua = UserAgentFeatureStep(self.context).transform(df)
 
-        # group by session and compute features
+        result = temporal
-        session_features = []
+        for other in [behavioral, product, ua]:
-        for session_id, session_df in interactions_df.groupby('sessionId'):
+            if not other.empty and 'sessionId' in other.columns:
-            new_slice = _apply_to_slice(session_df.sort_values('ts'))
+                result = result.merge(other, on='sessionId', how='left')
-            session_features.append(new_slice)
 
-        return pd.concat(session_features, ignore_index=True)
+        # carry forward experimentId for label joining
+        if 'experimentId' in df.columns:
+            exp_map = df.groupby('sessionId')['experimentId'].first()
+            result = result.merge(exp_map, on='sessionId', how='left')
+
+        return result
 
 
-
+class JoinLabelsStep(BaseContextStep):
-class FilterSessionInteractionsStep(BaseContextStep):
     """
-    Filter interactions DataFrame to specific session.
+    Join experiment labels to session features.
-
+    Input: (features_df, experiments_df) or features_df (fetches experiments)
-    Input: (interactions_df, session_id)
+    Output: labeled feature matrix with is_agent column
-    Output: interactions_df filtered to session_id
     """
 
-    def transform(self, data: tuple) -> pd.DataFrame:
+    def transform(self, X : tuple) -> pd.DataFrame:
-        interactions_df, session_id = data
+        data = X;
-        return interactions_df[interactions_df['sessionId'] == session_id].copy()
+        if isinstance(data, tuple):
+            features_df, experiments_df = data
+        else:
+            features_df = data
+            if 'experimentId' not in features_df.columns:
+                return features_df
+            exp_ids = features_df['experimentId'].dropna().unique().tolist()
+            experiments_df = self.context.provider.fetch_experiments(exp_ids) if exp_ids else pd.DataFrame()
+
+        if features_df.empty:
+            return features_df
+        if experiments_df.empty:
+            features_df['is_agent'] = np.nan
+            return features_df
+
+        exp = experiments_df.copy()
+        if 'id' in exp.columns:
+            exp = exp.rename(columns={'id': 'experimentId'})
+        if 'xp_human_only' in exp.columns:
+            exp['is_agent'] = ~exp['xp_human_only']
+
+        cols = ['experimentId'] + [c for c in ['is_agent', 'xp_human_only', 'xp_market_mode'] if c in exp.columns]
+        return features_df.merge(exp[cols].drop_duplicates(), on='experimentId', how='left')
+
+
+class ValidateDataStep(BaseContextStep):
+    """
+    Data quality checks before training.
+    Input: df
+    Output: df (unchanged, but logs validation report to context)
+    """
+    REQUIRED = ['sessionId', 'eventName', 'ts']
+
+    def transform(self, X: pd.DataFrame) -> pd.DataFrame:
+        df = X.copy()
+        report = {'status': 'valid', 'rows': len(df), 'sessions': 0}
+        if df.empty:
+            report['status'] = 'empty'
+            self.context.cache('validation_report', report)
+            return df
+
+        missing = [c for c in self.REQUIRED if c not in df.columns]
+        if missing:
+            report['status'] = 'invalid'
+            report['missing_cols'] = missing
+
+        report['sessions'] = df['sessionId'].nunique() if 'sessionId' in df.columns else 0
+        report['null_sessions'] = int(df['sessionId'].isna().sum()) if 'sessionId' in df.columns else 0
+        if 'experimentId' in df.columns:
+            report['null_experiments'] = int(df['experimentId'].isna().sum())
+
+        self.context.cache('validation_report', report)
+        return df
+
+
+# legacy compat - kept for backwards compatibility with existing code
+def _extract_features_for_session(session_df: pd.DataFrame, session_timeout_sec: float = 900) -> Dict[str, Any]:
+    """Single-session feature extraction (legacy interface)."""
+    defaults = {k: 0 for k in ['total_interactions', 'page_views', 'item_views', 'searches',
+                               'cart_adds', 'hovers', 'unique_products_viewed', 'product_view_depth',
+                               'session_duration_sec', 'interaction_velocity',
+                               'avg_time_between_events', 'std_time_between_events', 'cart_to_view_ratio']}
+    if session_df.empty:
+        return defaults
+
+    session_df = session_df.copy()
+    if 'sessionId' not in session_df.columns:
+        session_df['sessionId'] = 'tmp'
+
+    # use a dummy context for the steps
+    class DummyCtx: config = {} # should maybe inherit but whatever
+    ctx = DummyCtx()
+
+    t = TemporalFeatureStep(ctx, timeout_sec=session_timeout_sec).transform(session_df)
+    b = BehavioralFeatureStep(ctx).transform(session_df)
+    p = ProductFeatureStep(ctx).transform(session_df)
+
+    result = {}
+    for df in [t, b, p]:
+        if not df.empty:
+            for col in df.columns:
+                if col != 'sessionId':
+                    result[col] = df[col].iloc[0] if len(df) > 0 else 0
+
+    remap = {'hover_events': 'hovers', 'filter_events': 'searches', 'unique_pages': 'unique_pages_visited'}
+    for old, new in remap.items():
+        if old in result:
+            result[new] = result.pop(old)
+    return result

experiments/procesing/tests/conftest.py

@@ -269,3 +269,13 @@ def empty_context(empty_provider):
         store_mode='hotel',
         window_size='30s'
     )
+
+
+@pytest.fixture
+def session_interactions(mock_interactions):
+    """Enriched interaction data for session feature extraction tests"""
+    df = mock_interactions.copy()
+    df['userAgent'] = ['Mozilla/5.0 Chrome/120', 'Mozilla/5.0 Chrome/120',
+                       'HeadlessChrome/120', 'HeadlessChrome/120', 'HeadlessChrome/120']
+    df['metadata_base_price'] = [None, None, 150.0, 150.0, 200.0]
+    return df