diff --git a/mobile_verifier/migrations/52_rename_latest_timestamp.sql b/mobile_verifier/migrations/52_rename_latest_timestamp.sql
new file mode 100644
index 000000000..98e315605
--- /dev/null
+++ b/mobile_verifier/migrations/52_rename_latest_timestamp.sql
@@ -0,0 +1 @@
+ALTER TABLE IF EXISTS wifi_heartbeats RENAME COLUMN latest_timestamp TO first_timestamp;
diff --git a/mobile_verifier/src/heartbeats/last_location.rs b/mobile_verifier/src/heartbeats/last_location.rs
index 1c478c370..e90529d33 100644
--- a/mobile_verifier/src/heartbeats/last_location.rs
+++ b/mobile_verifier/src/heartbeats/last_location.rs
@@ -10,7 +10,8 @@ use super::Heartbeat;
 #[derive(Debug, sqlx::FromRow, Copy, Clone, PartialEq)]
 pub struct LastLocation {
     pub location_validation_timestamp: DateTime<Utc>,
-    pub latest_timestamp: DateTime<Utc>,
+    #[sqlx(rename = "first_timestamp")]
+    pub heartbeat_timestamp: DateTime<Utc>,
     pub lat: f64,
     pub lon: f64,
 }
@@ -18,13 +19,13 @@ pub struct LastLocation {
 impl LastLocation {
     pub fn new(
         location_validation_timestamp: DateTime<Utc>,
-        latest_timestamp: DateTime<Utc>,
+        heartbeat_timestamp: DateTime<Utc>,
         lat: f64,
         lon: f64,
     ) -> Self {
         Self {
             location_validation_timestamp,
-            latest_timestamp,
+            heartbeat_timestamp,
             lat,
             lon,
         }
@@ -113,13 +114,13 @@ impl LocationCache {
     ) -> anyhow::Result<Option<LastLocation>> {
         let last_location: Option<LastLocation> = sqlx::query_as(
             r#"
-            SELECT location_validation_timestamp, latest_timestamp, lat, lon
+            SELECT location_validation_timestamp, first_timestamp, lat, lon
             FROM wifi_heartbeats
             WHERE location_validation_timestamp IS NOT NULL
-                AND latest_timestamp >= $1
+                AND first_timestamp >= $1
                 AND hotspot_key = $2
                 AND $3 - location_validation_timestamp <= INTERVAL '24 hours'
-            ORDER BY latest_timestamp DESC
+            ORDER BY first_timestamp DESC
             LIMIT 1
             "#,
         )
@@ -193,7 +194,7 @@ mod tests {
             r#"
             INSERT INTO wifi_heartbeats
                 (
-                    hotspot_key, location_validation_timestamp, latest_timestamp,
+                    hotspot_key, location_validation_timestamp, first_timestamp,
                     truncated_timestamp, coverage_object,
 
                     -- hardcoded values
@@ -225,7 +226,7 @@ mod tests {
     ) -> LastLocation {
         LastLocation {
             location_validation_timestamp: nanos_trunc(location_validation_timestamp),
-            latest_timestamp: nanos_trunc(latest_timestamp),
+            heartbeat_timestamp: nanos_trunc(latest_timestamp),
             lat: 0.0,
             lon: 0.0,
         }
diff --git a/mobile_verifier/src/heartbeats/mod.rs b/mobile_verifier/src/heartbeats/mod.rs
index 3a3e79c2c..2fcda5460 100644
--- a/mobile_verifier/src/heartbeats/mod.rs
+++ b/mobile_verifier/src/heartbeats/mod.rs
@@ -556,10 +556,10 @@ impl ValidatedHeartbeat {
         let truncated_timestamp = self.truncated_timestamp()?;
         sqlx::query(
             r#"
-            INSERT INTO wifi_heartbeats (hotspot_key, cell_type, latest_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted, location_validation_timestamp, lat, lon)
+            INSERT INTO wifi_heartbeats (hotspot_key, cell_type, first_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted, location_validation_timestamp, lat, lon)
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
             ON CONFLICT (hotspot_key, truncated_timestamp) DO UPDATE SET
-            latest_timestamp = EXCLUDED.latest_timestamp,
+            first_timestamp = EXCLUDED.first_timestamp,
             coverage_object = EXCLUDED.coverage_object
             "#,
         )
diff --git a/mobile_verifier/src/rewarder/db.rs b/mobile_verifier/src/rewarder/db.rs
index f946ad5de..b7b772893 100644
--- a/mobile_verifier/src/rewarder/db.rs
+++ b/mobile_verifier/src/rewarder/db.rs
@@ -13,7 +13,7 @@ pub async fn no_wifi_heartbeats(
     reward_period: &Range<DateTime<Utc>>,
 ) -> anyhow::Result<bool> {
     let count = sqlx::query_scalar::<_, i64>(
-        "SELECT COUNT(*) FROM wifi_heartbeats WHERE latest_timestamp >= $1",
+        "SELECT COUNT(*) FROM wifi_heartbeats WHERE first_timestamp >= $1",
     )
     .bind(reward_period.end)
     .fetch_one(pool)
diff --git a/mobile_verifier/tests/integrations/heartbeats.rs b/mobile_verifier/tests/integrations/heartbeats.rs
index b5f7fe1e2..645c046f4 100644
--- a/mobile_verifier/tests/integrations/heartbeats.rs
+++ b/mobile_verifier/tests/integrations/heartbeats.rs
@@ -57,7 +57,7 @@ async fn only_fetch_latest_hotspot(pool: PgPool) -> anyhow::Result<()> {
         "11sctWiP9r5wDJVuDe1Th4XSL2vaawaLLSQF8f8iokAoMAJHxqp".parse()?;
     sqlx::query(
         r#"
-INSERT INTO wifi_heartbeats (hotspot_key, cell_type, latest_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
+INSERT INTO wifi_heartbeats (hotspot_key, cell_type, first_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
 VALUES
     ($2, 'novagenericwifiindoor', '2023-08-25 00:00:00+00', '2023-08-25 00:00:00+00', $3, 1.0, 0),
     ($2, 'novagenericwifiindoor', '2023-08-25 01:00:00+00', '2023-08-25 01:00:00+00', $3, 1.0, 0),
@@ -118,7 +118,7 @@ async fn ensure_minimum_count(pool: PgPool) -> anyhow::Result<()> {
 
     sqlx::query(
         r#"
-INSERT INTO wifi_heartbeats (hotspot_key, cell_type, latest_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
+INSERT INTO wifi_heartbeats (hotspot_key, cell_type, first_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
 VALUES
     ($1, 'novagenericwifiindoor', '2023-08-25 00:00:00+00', '2023-08-25 00:00:00+00', $2, 1.0, 0),
     ($1, 'novagenericwifiindoor', '2023-08-25 01:00:00+00', '2023-08-25 01:00:00+00', $2, 1.0, 0),
@@ -157,7 +157,7 @@ async fn ensure_wifi_hotspots_are_rewarded(pool: PgPool) -> anyhow::Result<()> {
         "112NqN2WWMwtK29PMzRby62fDydBJfsCLkCAf392stdok48ovNT6".parse()?;
     sqlx::query(
         r#"
-INSERT INTO wifi_heartbeats (hotspot_key, cell_type, latest_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
+INSERT INTO wifi_heartbeats (hotspot_key, cell_type, first_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
 VALUES
     ($1, 'novagenericwifiindoor', '2023-08-25 00:00:00+00', '2023-08-25 00:00:00+00', $2, 1.0, 0),
     ($1, 'novagenericwifiindoor', '2023-08-25 01:00:00+00', '2023-08-25 01:00:00+00', $2, 1.0, 0),
@@ -206,7 +206,7 @@ async fn ensure_wifi_hotspots_use_average_location_trust_score(pool: PgPool) ->
         "112NqN2WWMwtK29PMzRby62fDydBJfsCLkCAf392stdok48ovNT6".parse()?;
     sqlx::query(
         r#"
-INSERT INTO wifi_heartbeats (hotspot_key, cell_type, latest_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
+INSERT INTO wifi_heartbeats (hotspot_key, cell_type, first_timestamp, truncated_timestamp, coverage_object, location_trust_score_multiplier, distance_to_asserted)
 VALUES
     ($1, 'novagenericwifiindoor', '2023-08-25 00:00:00+00', '2023-08-25 00:00:00+00', $2, 1.0, 0),
     ($1, 'novagenericwifiindoor', '2023-08-25 01:00:00+00', '2023-08-25 01:00:00+00', $2, 1.0, 0),