database elsa changes

src/backend/db.py

@@ -99,6 +99,10 @@ CREATE_ELSA_MEDIA_TABLE = """CREATE TABLE elsa_media (
     title TEXT NOT NULL,
     signature TEXT NOT NULL,
     pages TEXT NOT NULL,
+    text_author TEXT,
+    book_author TEXT NOT NULL,
+    type TEXT NOT NULL,
     elsa_id INTEGER NOT NULL,
+    data TEXT NOT NULL,
     FOREIGN KEY (elsa_id) REFERENCES elsa (id)
   )"""