store annotations in db and sync with peers

oml/setup.py

@@ -151,6 +151,22 @@ CREATE TABLE listitem (
     FOREIGN KEY(item_id) REFERENCES item (id), 
     FOREIGN KEY(list_id) REFERENCES list (id)
 );
+CREATE TABLE annotation (
+    _id INTEGER NOT NULL,
+    id VARCHAR(43),
+    created DATETIME,
+    modified DATETIME,
+    user_id VARCHAR(43),
+    item_id VARCHAR(43),
+    data BLOB,
+    findquotes TEXT,
+    findnotes TEXT,
+    PRIMARY KEY (_id),
+    FOREIGN KEY(user_id) REFERENCES user (id),
+    FOREIGN KEY(item_id) REFERENCES item (id)
+);
+CREATE INDEX ix_annotation_findquotes ON annotation (findquotes);
+CREATE INDEX ix_annotation_findnotes ON annotation (findnotes);
 PRAGMA journal_mode=WAL
 '''
         for statement in sql.split(';'):