diff --git a/src/mvt/ios/modules/mixed/webkit_resource_load_statistics.py b/src/mvt/ios/modules/mixed/webkit_resource_load_statistics.py
index 55cd740..ef7b58f 100644
--- a/src/mvt/ios/modules/mixed/webkit_resource_load_statistics.py
+++ b/src/mvt/ios/modules/mixed/webkit_resource_load_statistics.py
@@ -85,35 +85,32 @@ class WebkitResourceLoadStatistics(IOSExtraction):
 
         try:
             try:
-                cur.execute(
-                    """
-                    SELECT
-                        domainID,
-                        registrableDomain,
-                        lastSeen,
-                        hadUserInteraction,
-                        mostRecentUserInteractionTime,
-                        mostRecentWebPushInteractionTime
-                    from ObservedDomains;
-                """
-                )
-                has_extra_timestamps = True
-            except sqlite3.OperationalError:
-                try:
-                    cur.execute(
-                        """
-                        SELECT
-                            domainID,
-                            registrableDomain,
-                            lastSeen,
-                            hadUserInteraction
-                        from ObservedDomains;
-                    """
-                    )
-                    has_extra_timestamps = False
-                except sqlite3.OperationalError:
+                cur.execute("PRAGMA table_info(ObservedDomains);")
+                available_columns = {row[1] for row in cur}
+                required_columns = [
+                    "domainID",
+                    "registrableDomain",
+                    "lastSeen",
+                    "hadUserInteraction",
+                ]
+                if not set(required_columns).issubset(available_columns):
                     return
 
+                optional_columns = [
+                    column
+                    for column in [
+                        "mostRecentUserInteractionTime",
+                        "mostRecentWebPushInteractionTime",
+                    ]
+                    if column in available_columns
+                ]
+                selected_columns = required_columns + optional_columns
+                cur.execute(
+                    f"SELECT {', '.join(selected_columns)} FROM ObservedDomains;"
+                )
+            except sqlite3.OperationalError:
+                return
+
             for row in cur:
                 result = {
                     "domain_id": row[0],
@@ -124,15 +121,19 @@ class WebkitResourceLoadStatistics(IOSExtraction):
                     "domain": domain,
                     "path": path,
                 }
-                if has_extra_timestamps:
-                    result["most_recent_user_interaction_time"] = row[4]
-                    result["most_recent_user_interaction_time_isodate"] = (
-                        convert_unix_to_iso(row[4])
-                    )
-                    result["most_recent_web_push_interaction_time"] = row[5]
-                    result["most_recent_web_push_interaction_time_isodate"] = (
-                        convert_unix_to_iso(row[5])
-                    )
+                for index, column in enumerate(optional_columns, start=4):
+                    field = {
+                        "mostRecentUserInteractionTime": (
+                            "most_recent_user_interaction_time"
+                        ),
+                        "mostRecentWebPushInteractionTime": (
+                            "most_recent_web_push_interaction_time"
+                        ),
+                    }[column]
+                    timestamp = row[index]
+                    result[field] = timestamp
+                    if timestamp is not None and timestamp >= 0:
+                        result[f"{field}_isodate"] = convert_unix_to_iso(timestamp)
                 self.results.append(result)
         finally:
             cur.close()
diff --git a/tests/ios_backup/test_webkit_resource_load_statistics.py b/tests/ios_backup/test_webkit_resource_load_statistics.py
index f0be231..5e30cfe 100644
--- a/tests/ios_backup/test_webkit_resource_load_statistics.py
+++ b/tests/ios_backup/test_webkit_resource_load_statistics.py
@@ -3,6 +3,8 @@
 # Use of this software is governed by the MVT License 1.1 that can be found at
 #   https://license.mvt.re/1.1/
 
+import sqlite3
+
 from mvt.common.module import run_module
 from mvt.ios.modules.mixed.webkit_resource_load_statistics import (
     WebkitResourceLoadStatistics,
@@ -19,3 +21,50 @@ class TestWebkitResourceLoadStatisticsModule:
         assert len(m.results) == 2
         assert len(m.timeline) == 2
         assert len(m.alertstore.alerts) == 0
+
+        results = {result["registrable_domain"]: result for result in m.results}
+        assert results["google.com"]["most_recent_user_interaction_time"] > 0
+        assert "most_recent_user_interaction_time_isodate" in results["google.com"]
+        assert results["gstatic.com"]["most_recent_user_interaction_time"] == -1.0
+        assert (
+            "most_recent_user_interaction_time_isodate"
+            not in results["gstatic.com"]
+        )
+        assert all(
+            "most_recent_web_push_interaction_time" not in result
+            for result in m.results
+        )
+
+    def test_webkit_full_timestamp_schema(self, tmp_path):
+        db_path = tmp_path / "observations.db"
+        conn = sqlite3.connect(db_path)
+        conn.execute(
+            """
+            CREATE TABLE ObservedDomains (
+                domainID INTEGER PRIMARY KEY,
+                registrableDomain TEXT NOT NULL,
+                lastSeen REAL NOT NULL,
+                hadUserInteraction INTEGER NOT NULL,
+                mostRecentUserInteractionTime REAL NOT NULL,
+                mostRecentWebPushInteractionTime REAL NOT NULL
+            );
+            """
+        )
+        conn.execute(
+            """
+            INSERT INTO ObservedDomains VALUES (?, ?, ?, ?, ?, ?);
+            """,
+            (1, "example.com", 1634560250.0, 1, 1634560030.0, -1.0),
+        )
+        conn.commit()
+        conn.close()
+
+        m = WebkitResourceLoadStatistics(target_path=str(tmp_path))
+        m._process_observations_db(str(db_path), "", "observations.db")
+
+        assert len(m.results) == 1
+        result = m.results[0]
+        assert result["most_recent_user_interaction_time"] == 1634560030.0
+        assert "most_recent_user_interaction_time_isodate" in result
+        assert result["most_recent_web_push_interaction_time"] == -1.0
+        assert "most_recent_web_push_interaction_time_isodate" not in result