Convert messages.content to JSONB. This is a very disruptive change.

apps/ssb/tf-app.js

@@ -158,7 +158,7 @@ class TfElement extends LitElement {
 	async fetch_new_message(id) {
 		let messages = await tfrpc.rpc.query(
 			`
-				SELECT messages.*
+				SELECT id, previous, author, sequence, timestamp, hash, json(content), signature
 				FROM messages
 				JOIN json_each(?) AS following ON messages.author = following.value
 				WHERE messages.id = ?
@@ -221,7 +221,7 @@ class TfElement extends LitElement {
 		this.tags = await tfrpc.rpc.query(
 			`
 			WITH
-				recent AS (SELECT id, content FROM messages
+				recent AS (SELECT id, json(content) AS content FROM messages
 					WHERE messages.timestamp > ? AND json_extract(content, '$.type') = 'post'
 					ORDER BY timestamp DESC LIMIT 1024),
 				recent_channels AS (SELECT recent.id, '#' || json_extract(content, '$.channel') AS tag