diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2c994e8c8..9ee5197b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,3 +8,4 @@ All notable Modrinth Plus changes are documented here.
 - Added Gitea Actions verification for the Modrinth Plus fork.
 - Added Windows installer publishing to the Gitea generic package registry.
 - Added Codex repository context and release/security documentation.
+- Fixed startup compatibility with existing official Modrinth App databases that recorded a different checksum for the historical initial SQLite migration.
diff --git a/packages/app-lib/src/state/db.rs b/packages/app-lib/src/state/db.rs
index b2a180560..e43825c3e 100644
--- a/packages/app-lib/src/state/db.rs
+++ b/packages/app-lib/src/state/db.rs
@@ -6,6 +6,9 @@ use sqlx::{Pool, Sqlite};
 use std::str::FromStr;
 use std::time::Duration;
 
+static MIGRATOR: sqlx::migrate::Migrator = sqlx::migrate!();
+const HISTORICAL_INIT_MIGRATION_VERSION: i64 = 20240711194701;
+
 pub(crate) async fn connect(
     app_identifier: &str,
 ) -> crate::Result<Pool<Sqlite>> {
@@ -31,7 +34,8 @@ pub(crate) async fn connect(
         .connect_with(conn_options)
         .await?;
 
-    sqlx::migrate!().run(&pool).await?;
+    reconcile_historical_migration_checksums(&pool).await?;
+    MIGRATOR.run(&pool).await?;
 
     if let Err(err) = stale_data_cleanup(&pool).await {
         tracing::warn!(
@@ -42,6 +46,55 @@ pub(crate) async fn connect(
     Ok(pool)
 }
 
+async fn reconcile_historical_migration_checksums(
+    pool: &Pool<Sqlite>,
+) -> crate::Result<()> {
+    let Some(init_migration) = MIGRATOR.iter().find(|migration| {
+        migration.version == HISTORICAL_INIT_MIGRATION_VERSION
+    })
+    else {
+        return Ok(());
+    };
+
+    let has_migration_table: i64 = sqlx::query_scalar(
+        "SELECT COUNT(*) FROM sqlite_master WHERE type = 'table' AND name = '_sqlx_migrations'",
+    )
+    .fetch_one(pool)
+    .await?;
+
+    if has_migration_table == 0 {
+        return Ok(());
+    }
+
+    let stored_checksum: Option<Vec<u8>> = sqlx::query_scalar(
+        "SELECT checksum FROM _sqlx_migrations WHERE version = ? AND success = TRUE",
+    )
+    .bind(HISTORICAL_INIT_MIGRATION_VERSION)
+    .fetch_optional(pool)
+    .await?;
+
+    if let Some(stored_checksum) = stored_checksum {
+        let bundled_checksum = init_migration.checksum.as_ref();
+
+        if stored_checksum != bundled_checksum {
+            tracing::warn!(
+                "Reconciling checksum for historical Modrinth init migration {}",
+                HISTORICAL_INIT_MIGRATION_VERSION
+            );
+
+            sqlx::query(
+                "UPDATE _sqlx_migrations SET checksum = ? WHERE version = ? AND success = TRUE",
+            )
+            .bind(bundled_checksum)
+            .bind(HISTORICAL_INIT_MIGRATION_VERSION)
+            .execute(pool)
+            .await?;
+        }
+    }
+
+    Ok(())
+}
+
 /// Cleans up data from the database that is no longer referenced, but must be
 /// kept around for a little while to allow users to recover from accidental
 /// deletions.