refactored note attachment into note ancillary

db/migrations/0214__migrate_canvas_note_to_ancillary.js

@@ -0,0 +1,39 @@
+module.exports = async () => {
+    const cls = require("../../src/services/cls");
+    const beccaLoader = require("../../src/becca/becca_loader");
+    const becca = require("../../src/becca/becca");
+    const log = require("../../src/services/log");
+
+    await cls.init(async () => {
+        beccaLoader.load();
+
+        for (const note of Object.values(becca.notes)) {
+            if (note.type !== 'canvas') {
+                continue;
+            }
+
+            if (note.isProtected) {
+                // can't migrate protected notes, but that's not critical.
+                continue;
+            }
+
+            const content = note.getContent(true);
+            let svg;
+
+            try {
+                const payload = JSON.parse(content);
+                svg = payload?.svg;
+
+                if (!svg) {
+                    continue;
+                }
+            }
+            catch (e) {
+                log.info(`Could not create a note ancillary for canvas "${note.noteId}" with error: ${e.message} ${e.stack}`);
+                continue;
+            }
+
+            note.saveNoteAncillary('canvasSvg', 'image/svg+xml', svg);
+        }
+    });
+};