when checking if series/author is alread in DB, use case insensitive match only for ASCII names

server/models/Author.js

@@ -53,6 +53,17 @@ class Author extends Model {
    * @returns {Promise<Author>}
    */
   static async getByNameAndLibrary(authorName, libraryId) {
+    const containsOnlyASCII = /^[\u0000-\u007f]*$/.test(authorName)
+
+    // SQLite does not support lower with non-Unicode chars
+    if (!containsOnlyASCII) {
+      return this.findOne({
+        where: {
+          name: authorName,
+          libraryId: libraryId
+        }
+      })
+    } else {
       return this.findOne({
         where: [
           where(fn('lower', col('name')), authorName.toLowerCase()),
@@ -62,6 +73,7 @@ class Author extends Model {
         ]
       })
     }
+  }
 
   /**
    *

server/models/Series.js

@@ -39,6 +39,17 @@ class Series extends Model {
    * @returns {Promise<Series>}
    */
   static async getByNameAndLibrary(seriesName, libraryId) {
+    const containsOnlyASCII = /^[\u0000-\u007f]*$/.test(authorName)
+
+    // SQLite does not support lower with non-Unicode chars
+    if (!containsOnlyASCII) {
+      return this.findOne({
+        where: {
+          name: seriesName,
+          libraryId: libraryId
+        }
+      })
+    } else {
       return this.findOne({
         where: [
           where(fn('lower', col('name')), seriesName.toLowerCase()),
@@ -48,6 +59,7 @@ class Series extends Model {
         ]
       })
     }
+  }
 
   /**
    * Initialize model