diff --git a/d2m/converters/edit-to-changes.js b/d2m/converters/edit-to-changes.js
index ef170ca..dd8e39f 100644
--- a/d2m/converters/edit-to-changes.js
+++ b/d2m/converters/edit-to-changes.js
@@ -6,6 +6,8 @@ const passthrough = require("../../passthrough")
 const {sync, select, from} = passthrough
 /** @type {import("./message-to-event")} */
 const messageToEvent = sync.require("../converters/message-to-event")
+/** @type {import("../../m2d/converters/utils")} */
+const utils = sync.require("../../m2d/converters/utils")
 
 function eventCanBeEdited(ev) {
 	// Discord does not allow files, images, attachments, or videos to be edited.
@@ -37,7 +39,18 @@ async function editToChanges(message, guild, api) {
 	const roomID = select("channel_room", "room_id", {channel_id: message.channel_id}).pluck().get()
 	assert(roomID)
 	/** @type {string?} Null if we don't have a sender in the room, which will happen if it's a webhook's message. The bridge bot will do the edit instead. */
-	const senderMxid = message.author && from("sim").join("sim_member", "mxid").where({user_id: message.author.id, room_id: roomID}).pluck("mxid").get() || null
+	let senderMxid = null
+	if (message.author) {
+		senderMxid = from("sim").join("sim_member", "mxid").where({user_id: message.author.id, room_id: roomID}).pluck("mxid").get() || null
+	} else {
+		// Should be a system generated embed. We want the embed to be sent by the same user who sent the message, so that the messages get grouped in most clients.
+		const eventID = select("event_message", "event_id", {message_id: message.id}).pluck().get()
+		assert(eventID) // this should have been checked earlier in a calling function
+		const event = await api.getEvent(roomID, eventID)
+		if (utils.eventSenderIsFromDiscord(event.sender)) {
+			senderMxid = event.sender
+		}
+	}
 
 	const oldEventRows = select("event_message", ["event_id", "event_type", "event_subtype", "part", "reaction_part"], {message_id: message.id}).all()
 
diff --git a/d2m/converters/edit-to-changes.test.js b/d2m/converters/edit-to-changes.test.js
index 1004c34..b00a2c4 100644
--- a/d2m/converters/edit-to-changes.test.js
+++ b/d2m/converters/edit-to-changes.test.js
@@ -237,7 +237,15 @@ test("edit2changes: promotes the text event when multiple rows have part = 1 (sh
 })
 
 test("edit2changes: generated embed", async t => {
-	const {eventsToRedact, eventsToReplace, eventsToSend, promotions} = await editToChanges(data.message_update.embed_generated_social_media_image, data.guild.general, {})
+	let called = 0
+	const {senderMxid, eventsToRedact, eventsToReplace, eventsToSend, promotions} = await editToChanges(data.message_update.embed_generated_social_media_image, data.guild.general, {
+		async getEvent(roomID, eventID) {
+			called++
+			t.equal(roomID, "!kLRqKKUQXcibIMtOpl:cadence.moe")
+			t.equal(eventID, "$mPSzglkCu-6cZHbYro0RW2u5mHvbH9aXDjO5FCzosc0")
+			return {sender: "@_ooye_cadence:cadence.moe"}
+		}
+	})
 	t.deepEqual(eventsToRedact, [])
 	t.deepEqual(eventsToReplace, [])
 	t.deepEqual(eventsToSend, [{
@@ -259,4 +267,6 @@ test("edit2changes: generated embed", async t => {
 		"m.mentions": {}
 	}])
 	t.deepEqual(promotions, []) // TODO: it would be ideal to promote this to reaction_part = 0. this is OK to do because the main message won't have had any reactions yet.
+	t.equal(senderMxid, "@_ooye_cadence:cadence.moe")
+	t.equal(called, 1)
 })
diff --git a/d2m/event-dispatcher.js b/d2m/event-dispatcher.js
index 2c4dcd5..54d858a 100644
--- a/d2m/event-dispatcher.js
+++ b/d2m/event-dispatcher.js
@@ -268,7 +268,8 @@ module.exports = {
 
 		// Based on looking at data they've sent me over the gateway, this is the best way to check for meaningful changes.
 		// If the message content is a string then it includes all interesting fields and is meaningful.
-		if (typeof data.content === "string") {
+		// Otherwise, if there are embeds, then the system generated URL preview embeds.
+		if (typeof data.content === "string" || "embeds" in data) {
 			/** @type {DiscordTypes.GatewayMessageCreateDispatchData} */
 			// @ts-ignore
 			const message = data
diff --git a/scripts/capture-message-update-events.js b/scripts/capture-message-update-events.js
index f345d3f..671b062 100644
--- a/scripts/capture-message-update-events.js
+++ b/scripts/capture-message-update-events.js
@@ -37,7 +37,7 @@ passthrough.discord = discord
 })()
 
 const events = new sqlite("scripts/events.db")
-const sql = "INSERT INTO \"update\" (json, " + interestingFields.join(", ") + ") VALUES (" + "?".repeat(interestingFields.length + 1).split("").join(", ") + ")"
+const sql = "INSERT INTO update_event (json, " + interestingFields.join(", ") + ") VALUES (" + "?".repeat(interestingFields.length + 1).split("").join(", ") + ")"
 console.log(sql)
 const prepared = events.prepare(sql)