diff --git a/aukpy/create_tables.sql b/aukpy/create_tables.sql
index 19ff685..89fb6d1 100644
--- a/aukpy/create_tables.sql
+++ b/aukpy/create_tables.sql
@@ -67,12 +67,13 @@ CREATE TABLE IF NOT EXISTS sampling_event (
     trip_comments text,
     all_species_reported integer,
     number_observers integer,
-    UNIQUE(sampling_event_identifier)
+    location_data_id integer,
+    UNIQUE(sampling_event_identifier),
+    FOREIGN KEY (location_data_id) REFERENCES location_data(id)
 );
 
 CREATE TABLE IF NOT EXISTS observation (
     id integer PRIMARY KEY,
-    location_data_id integer NOT NULL,
     species_id integer NOT NULL,
     breeding_id integer,
     protocol_id integer,
@@ -91,6 +92,5 @@ CREATE TABLE IF NOT EXISTS observation (
     FOREIGN KEY (sampling_event_id) REFERENCES sampling_event(id),
     FOREIGN KEY (species_id) REFERENCES species(id),
     FOREIGN KEY (breeding_id) REFERENCES breeding(id),
-    FOREIGN KEY (location_data_id) REFERENCES location_data(id),
     FOREIGN KEY (protocol_id) REFERENCES protocol(id)
 );
diff --git a/aukpy/db.py b/aukpy/db.py
index 9bb7859..b9f2c64 100644
--- a/aukpy/db.py
+++ b/aukpy/db.py
@@ -9,7 +9,8 @@
 import sqlite3
 
 from pathlib import Path
-from typing import Dict, List, Optional, Tuple, Any
+from time import time
+from typing import Dict, Optional, Tuple, Any
 
 from aukpy import config
 
@@ -217,6 +218,7 @@ def insert(
         assert len(idx_id_map) == len(df)
         as_series = pd.Series(idx_id_map)
         df[f"{cls.table_name}_id"] = as_series
+        df.drop(list(cls.columns), axis=1, inplace=True)
         return df, cache
 
 
@@ -312,10 +314,11 @@ class SamplingWrapper(TableWrapper):
         "trip_comments",
         "all_species_reported",
         "number_observers",
+        "location_data_id",
     )
     insert_query = """INSERT OR IGNORE INTO sampling_event
-        (sampling_event_identifier, observation_date, time_observations_started, observer_id, effort_distance_km, effort_area_ha, duration_minutes, trip_comments, all_species_reported, number_observers)
-        VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+        (sampling_event_identifier, observation_date, time_observations_started, observer_id, effort_distance_km, effort_area_ha, duration_minutes, trip_comments, all_species_reported, number_observers, location_data_id)
+        VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
     """
     unique_columns = ("sampling_event_identifier",)
 
@@ -341,11 +344,22 @@ def df_processing(cls, df: pd.DataFrame) -> pd.DataFrame:
 
         return df
 
+    @classmethod
+    def insert(
+        cls,
+        df: pd.DataFrame,
+        db: sqlite3.Connection,
+        cache: Optional[Dict[Any, int]] = None,
+    ) -> Tuple[pd.DataFrame, Dict[Any, int]]:
+
+        df, cache = LocationWrapper.insert(df, db, cache=cache)
+        return super().insert(df, db, cache=cache)
+
 
 class ObservationWrapper(TableWrapper):
     table_name = "observation"
     columns = (
-        "location_data_id",
+        # "location_data_id",
         "species_id",
         "breeding_id",
         "protocol_id",
@@ -383,7 +397,6 @@ class ObservationWrapper(TableWrapper):
         ?,
         ?,
         ?,
-        ?,
         ?
     );""".format(
         ",\n".join(columns)
@@ -408,9 +421,22 @@ def df_processing(cls, df: pd.DataFrame) -> pd.DataFrame:
 
         return df
 
+    @classmethod
+    def insert(
+        cls,
+        df: pd.DataFrame,
+        db: sqlite3.Connection,
+        cache: Optional[Dict[Any, int]] = None,
+    ) -> Tuple[pd.DataFrame, Dict[Any, int]]:
+        # Table specific preprocessing
+        if cache is None:
+            cache = {}
+        sub_frame = cls.df_processing(df.loc[:, list(cls.columns)])
+        sub_frame.to_sql("observation", con=db, if_exists="append", index=False)
+        return df, cache
+
 
 WRAPPERS = (
-    LocationWrapper,
     SpeciesWrapper,
     BreedingWrapper,
     ProtocolWrapper,
@@ -467,9 +493,7 @@ def build_db_pandas(
         df, _ = wrapper.insert(df, conn)
 
     # Store main observations table
-    used_columns = [y for x in WRAPPERS for y in x.columns]
-    just_obs = df.drop(used_columns, axis=1)
-    ObservationWrapper.insert(just_obs, conn)
+    ObservationWrapper.insert(df, conn)
     conn.commit()
     return conn
 
@@ -507,8 +531,6 @@ def build_db_incremental(
             subtable_cache[wrapper.__name__] = cache
 
         # Store main observations table
-        used_columns = [y for x in WRAPPERS for y in x.columns]
-        just_obs = df.drop(used_columns, axis=1)
-        ObservationWrapper.insert(just_obs, conn)
+        ObservationWrapper.insert(df, conn)
         conn.commit()
     return conn
diff --git a/tests/perf_test.py b/tests/perf_test.py
index e56453e..70c5120 100644
--- a/tests/perf_test.py
+++ b/tests/perf_test.py
@@ -4,7 +4,7 @@
 import pytest
 from aukpy import db
 
-from tests.db_test import SMALL, MEDIUM
+from tests.db_test import SMALL, MEDIUM, SKIP_NON_MOCKED
 
 
 def check_usage(csv_file: Path):
@@ -28,7 +28,10 @@ def check_usage(csv_file: Path):
     print(f"Size of observation: {res}")
 
 
-@pytest.mark.skip
+@pytest.mark.skipif(**SKIP_NON_MOCKED)  # type: ignore
 def test_data_usage():
-    for csv_file in (SMALL, MEDIUM):
+    for csv_file in (
+        SMALL,
+        MEDIUM,
+    ):
         check_usage(csv_file)