pinakes-core: unify book metadata extraction; remove ExtractedBookMetadata

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ifd6e66515b9ff78a4bb13eba47b9b2cf6a6a6964

crates/pinakes-core/src/model.rs

@@ -417,6 +417,10 @@ pub struct SavedSearch {
 // Book Management Types
 
 /// Metadata for book-type media.
+///
+/// Used both as a DB record (with populated `media_id`, `created_at`,
+/// `updated_at`) and as an extraction result (with placeholder values for
+/// those fields when the record has not yet been persisted).
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BookMetadata {
   pub media_id:         MediaId,
@@ -435,6 +439,28 @@ pub struct BookMetadata {
   pub updated_at:       DateTime<Utc>,
 }
 
+impl Default for BookMetadata {
+  fn default() -> Self {
+    let now = Utc::now();
+    Self {
+      media_id:         MediaId(uuid::Uuid::nil()),
+      isbn:             None,
+      isbn13:           None,
+      publisher:        None,
+      language:         None,
+      page_count:       None,
+      publication_date: None,
+      series_name:      None,
+      series_index:     None,
+      format:           None,
+      authors:          Vec::new(),
+      identifiers:      HashMap::new(),
+      created_at:       now,
+      updated_at:       now,
+    }
+  }
+}
+
 /// Information about a book author.
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 pub struct AuthorInfo {
@@ -476,22 +502,6 @@ impl AuthorInfo {
   }
 }
 
-/// Book metadata extracted from files (without database-specific fields)
-#[derive(Debug, Clone, Default, Serialize, Deserialize)]
-pub struct ExtractedBookMetadata {
-  pub isbn:             Option<String>,
-  pub isbn13:           Option<String>,
-  pub publisher:        Option<String>,
-  pub language:         Option<String>,
-  pub page_count:       Option<i32>,
-  pub publication_date: Option<chrono::NaiveDate>,
-  pub series_name:      Option<String>,
-  pub series_index:     Option<f64>,
-  pub format:           Option<String>,
-  pub authors:          Vec<AuthorInfo>,
-  pub identifiers:      HashMap<String, Vec<String>>,
-}
-
 /// Reading progress for a book.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ReadingProgress {