diff --git a/src/db/mod.rs b/src/db/mod.rs
index 226fe39..e47bf7c 100644
--- a/src/db/mod.rs
+++ b/src/db/mod.rs
@@ -181,6 +181,12 @@ pub async fn list_note_stats(
         DatabaseKind::Postgres => "$1",
         DatabaseKind::Sqlite | DatabaseKind::MySql => "?",
     };
+    // PostgreSQL promotes SUM(BIGINT) to NUMERIC. sqlx::Any cannot decode the
+    // database-specific NUMERIC type, so normalize the aggregate to BIGINT.
+    let file_size_sum = match pool.kind() {
+        DatabaseKind::Postgres => "COALESCE(SUM(f.size_bytes), 0)::BIGINT",
+        DatabaseKind::Sqlite | DatabaseKind::MySql => "COALESCE(SUM(f.size_bytes), 0)",
+    };
     let query = format!(
         "SELECT n.id AS note_id, \
          ((SELECT COUNT(DISTINCT r.author) FROM note_revisions r \
@@ -189,7 +195,7 @@ pub async fn list_note_stats(
             SELECT 1 FROM note_revisions r WHERE r.note_id = n.id AND r.author = n.created_by\
           ) THEN 1 ELSE 0 END) AS participant_count, \
          (SELECT COUNT(*) FROM note_files f WHERE f.note_id = n.id) AS file_count, \
-         (SELECT COALESCE(SUM(f.size_bytes), 0) FROM note_files f WHERE f.note_id = n.id) AS file_size_bytes, \
+         (SELECT {file_size_sum} FROM note_files f WHERE f.note_id = n.id) AS file_size_bytes, \
          (SELECT COUNT(*) FROM note_revisions r WHERE r.note_id = n.id) AS revision_count \
          FROM notes n WHERE n.workspace_id = {placeholder}"
     );