fix: prevent string values from being inserted into numeric columns

Add _events/_sessions/_views etc. to generic_patterns in config.py so
FEATURE_USAGE_EVENTS and similar numeric columns aren't misclassified as
AI_GEN (which generates text). Add a string→numeric coercion guard in
convert_value() as a second safety net for any future misclassification.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

legitdata_bridge.py

@@ -233,7 +233,13 @@ class KeyPairSnowflakeWriter:
                         value = value[:max_len]
                 
                 # Clamp numbers to fit DECIMAL precision
-                elif 'NUMBER' in data_type or 'DECIMAL' in data_type or 'NUMERIC' in data_type:
+                elif 'NUMBER' in data_type or 'DECIMAL' in data_type or 'NUMERIC' in data_type or 'INT' in data_type or 'FLOAT' in data_type:
+                    # If a string landed in a numeric column (AI misclassification), coerce or null it
+                    if isinstance(value, str):
+                        try:
+                            value = float(value)
+                        except (ValueError, TypeError):
+                            return None  # Can't coerce — use NULL rather than crash
                     precision = info.get('precision', 38)
                     scale = info.get('scale', 0)
                     if isinstance(value, (int, float)):

legitdata_project/legitdata/config.py

@@ -110,6 +110,20 @@ COLUMN_HINTS = {
         r"created.*",
         r"updated.*",
         r"modified.*",
+        # Numeric event/activity columns — must be numbers, not text
+        r".*_events$",
+        r".*_sessions$",
+        r".*_views$",
+        r".*_clicks$",
+        r".*_impressions$",
+        r".*_conversions$",
+        r".*_installs$",
+        r".*_signups$",
+        r".*_leads$",
+        r"num_.*",
+        r".*_num$",
+        r".*_usage$",
+        r".*_volume$",
     ]
 }