Code to read and write annotations to the calibre db

resources/metadata_sqlite.sql

@@ -152,7 +152,7 @@ CREATE TABLE annotations ( id INTEGER PRIMARY KEY,
 	annot_type TEXT NOT NULL,
 	annot_data TEXT NOT NULL,
 	searchable_text TEXT NOT NULL,
-    UNIQUE(book, user_type, user, format, annot_id)
+    UNIQUE(book, user_type, user, format, annot_type, annot_id)
 );
 
 CREATE VIEW meta AS