diff --git a/src/external/database/mod.rs b/src/external/database/mod.rs
index 72a8931..ceca477 100644
--- a/src/external/database/mod.rs
+++ b/src/external/database/mod.rs
@@ -3,5 +3,5 @@ pub mod json;
 #[cfg(feature = "database-sqlite")]
 pub mod sql;
 
-#[cfg(feature = "database-json")]
+#[cfg(any(feature = "database-json", feature = "database-sqlite"))]
 mod serde;
diff --git a/src/external/database/serde/common.rs b/src/external/database/serde/common.rs
index e46b3de..2dfea05 100644
--- a/src/external/database/serde/common.rs
+++ b/src/external/database/serde/common.rs
@@ -5,6 +5,8 @@ use crate::core::collection::{
     musicbrainz::MbRefOption,
 };
 
+pub const V20250103: &str = "V20250103";
+
 #[derive(Debug, Deserialize, Serialize)]
 #[serde(remote = "AlbumLibId")]
 pub enum AlbumLibIdDef {
diff --git a/src/external/database/sql/backend.rs b/src/external/database/sql/backend.rs
index 41efd1c..3273751 100644
--- a/src/external/database/sql/backend.rs
+++ b/src/external/database/sql/backend.rs
@@ -1,4 +1,4 @@
-//! Module for storing MusicHoard data in a JSON file database.
+//! Module for storing MusicHoard data in a SQLite database.
 
 use std::path::PathBuf;
 
@@ -10,7 +10,7 @@ use crate::{
     collection::album::AlbumDate,
     external::database::{
         serde::{
-            common::SerdeAlbumDate,
+            common::{SerdeAlbumDate, V20250103},
             deserialize::{DeserializeAlbum, DeserializeArtist, DeserializeDatabase},
             serialize::{SerializeAlbum, SerializeArtist, SerializeDatabase},
         },
@@ -157,7 +157,7 @@ impl ISqlTransactionBackend for SqlTransactionSqliteBackend<'_> {
              VALUES (?1, ?2)",
         )?;
         let version = match version {
-            SerializeDatabase::V20250103(_) => "V20250103",
+            SerializeDatabase::V20250103(_) => V20250103,
         };
         Self::execute(&mut stmt, ("version", version))
     }
@@ -168,16 +168,11 @@ impl ISqlTransactionBackend for SqlTransactionSqliteBackend<'_> {
         let mut rows = Self::query(&mut stmt, ())?;
 
         match Self::next_row(&mut rows)? {
-            Some(row) => {
-                let version: String = Self::get_value(row, 0)?;
-                match version.as_str() {
-                    "V20250103" => Ok(DeserializeDatabase::V20250103(vec![])),
-                    s => Err(Error::SerDeError(format!("unknown database version: {s}"))),
-                }
-            }
-            None => Err(Error::SerDeError(String::from(
-                "database version is missing",
-            ))),
+            Some(row) => match Self::get_value::<String>(row, 0)?.as_str() {
+                V20250103 => Ok(DeserializeDatabase::V20250103(vec![])),
+                s => Err(Error::SerDeError(format!("unknown database version: {s}"))),
+            },
+            None => Err(Error::SerDeError(String::from("missing database version"))),
         }
     }
 
diff --git a/src/external/musicbrainz/api/mod.rs b/src/external/musicbrainz/api/mod.rs
index 75c3c66..bc3cc60 100644
--- a/src/external/musicbrainz/api/mod.rs
+++ b/src/external/musicbrainz/api/mod.rs
@@ -227,7 +227,7 @@ impl<'de> Deserialize<'de> for SerdeMbid {
 }
 
 #[derive(Debug, Clone)]
-pub struct SerdeAlbumDate(pub AlbumDate);
+pub struct SerdeAlbumDate(AlbumDate);
 
 impl From<SerdeAlbumDate> for AlbumDate {
     fn from(value: SerdeAlbumDate) -> Self {