diff --git a/d2m/actions/edit-message.js b/d2m/actions/edit-message.js
index 662e124..933267c 100644
--- a/d2m/actions/edit-message.js
+++ b/d2m/actions/edit-message.js
@@ -1,94 +1,5 @@
-// @ts-check
-
-const assert = require("assert")
-
-const passthrough = require("../../passthrough")
-const { discord, sync, db } = passthrough
-/** @type {import("../converters/message-to-event")} */
-const messageToEvent = sync.require("../converters/message-to-event")
-/** @type {import("../../matrix/api")} */
-const api = sync.require("../../matrix/api")
-/** @type {import("./register-user")} */
-const registerUser = sync.require("./register-user")
-/** @type {import("../actions/create-room")} */
-const createRoom = sync.require("../actions/create-room")
-
-/**
- * @param {import("discord-api-types/v10").GatewayMessageCreateDispatchData} message
- * @param {import("discord-api-types/v10").APIGuild} guild
- */
-async function editMessage(message, guild) {
-	// Figure out what events we will be replacing
-
-	const roomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").get(message.channel_id)
-	const senderMxid = await registerUser.ensureSimJoined(message.author, roomID)
-	/** @type {{event_id: string, event_type: string, event_subtype: string?, part: number}[]} */
-   const oldEventRows = db.prepare("SELECT event_id, event_type, event_subtype, part FROM event_message WHERE message_id = ?").all(message.id)
-
-	// Figure out what we will be replacing them with
-
-	const newEvents = await messageToEvent.messageToEvent(message, guild, api)
-
-	// Match the new events to the old events
-
-	/*
-		Rules:
-			+ The events must have the same type.
-			+ The events must have the same subtype.
-		Events will therefore be divided into three categories:
-	*/
-	/** 1. Events that are matched, and should be edited by sending another m.replace event */
-	let eventsToReplace = []
-	/** 2. Events that are present in the old version only, and should be blanked or redacted */
-	let eventsToRedact = []
-	/** 3. Events that are present in the new version only, and should be sent as new, with references back to the context */
-	let eventsToSend = []
-
-	// For each old event...
-	outer: while (newEvents.length) {
-		const newe = newEvents[0]
-		// Find a new event to pair it with...
-		let handled = false
-		for (let i = 0; i < oldEventRows.length; i++) {
-			const olde = oldEventRows[i]
-			if (olde.event_type === newe.$type && olde.event_subtype === (newe.msgtype || null)) {
-				// Found one!
-				// Set up the pairing
-				eventsToReplace.push({
-					old: olde,
-					new: newe
-				})
-				// These events have been handled now, so remove them from the source arrays
-				newEvents.shift()
-				oldEventRows.splice(i, 1)
-				// Go all the way back to the start of the next iteration of the outer loop
-				continue outer
-			}
-		}
-		// If we got this far, we could not pair it to an existing event, so it'll have to be a new one
-		eventsToSend.push(newe)
-		newEvents.shift()
-	}
-	// Anything remaining in oldEventRows is present in the old version only and should be redacted.
-	eventsToRedact = oldEventRows
-
-	// Now, everything in eventsToSend and eventsToRedact is a real change, but everything in eventsToReplace might not have actually changed!
-	// (Consider a MESSAGE_UPDATE for a text+image message - Discord does not allow the image to be changed, but the text might have been.)
-	// So we'll remove entries from eventsToReplace that *definitely* cannot have changed. Everything remaining *may* have changed.
-	eventsToReplace = eventsToReplace.filter(ev => {
-		// Discord does not allow files, images, attachments, or videos to be edited.
-		if (ev.old.event_type === "m.room.message" && ev.old.event_subtype !== "m.text" && ev.old.event_subtype !== "m.emote") {
-			return false
-		}
-		// Discord does not allow stickers to be edited.
-		if (ev.old.event_type === "m.sticker") {
-			return false
-		}
-		// Anything else is fair game.
-		return true
-	})
-
-	// Action time!
+async function editMessage() {
+   	// Action time!
 
 	// 1. Replace all the things.
 
@@ -113,6 +24,5 @@ async function editMessage(message, guild) {
 	}
 
 	return eventIDs
-}
 
-module.exports.editMessage = editMessage
+{eventsToReplace, eventsToRedact, eventsToSend}
diff --git a/d2m/converters/edit-to-changes.js b/d2m/converters/edit-to-changes.js
new file mode 100644
index 0000000..0dd084f
--- /dev/null
+++ b/d2m/converters/edit-to-changes.js
@@ -0,0 +1,96 @@
+// @ts-check
+
+const assert = require("assert")
+
+const passthrough = require("../../passthrough")
+const { discord, sync, db } = passthrough
+/** @type {import("./message-to-event")} */
+const messageToEvent = sync.require("../converters/message-to-event")
+/** @type {import("../../matrix/api")} */
+const api = sync.require("../../matrix/api")
+/** @type {import("../actions/register-user")} */
+const registerUser = sync.require("./register-user")
+/** @type {import("../actions/create-room")} */
+const createRoom = sync.require("../actions/create-room")
+
+/**
+ * @param {import("discord-api-types/v10").GatewayMessageCreateDispatchData} message
+ * IMPORTANT: This may not have all the normal fields! The API documentation doesn't provide possible types, just says it's all optional!
+ * Since I don't have a spec, I will have to capture some real traffic and add it as test cases... I hope they don't change anything later...
+ * @param {import("discord-api-types/v10").APIGuild} guild
+ */
+async function editToChanges(message, guild) {
+	// Figure out what events we will be replacing
+
+	const roomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").get(message.channel_id)
+	const senderMxid = await registerUser.ensureSimJoined(message.author, roomID)
+	/** @type {{event_id: string, event_type: string, event_subtype: string?, part: number}[]} */
+   const oldEventRows = db.prepare("SELECT event_id, event_type, event_subtype, part FROM event_message WHERE message_id = ?").all(message.id)
+
+	// Figure out what we will be replacing them with
+
+	const newEvents = await messageToEvent.messageToEvent(message, guild, api)
+
+	// Match the new events to the old events
+
+	/*
+		Rules:
+			+ The events must have the same type.
+			+ The events must have the same subtype.
+		Events will therefore be divided into three categories:
+	*/
+	/** 1. Events that are matched, and should be edited by sending another m.replace event */
+	let eventsToReplace = []
+	/** 2. Events that are present in the old version only, and should be blanked or redacted */
+	let eventsToRedact = []
+	/** 3. Events that are present in the new version only, and should be sent as new, with references back to the context */
+	let eventsToSend = []
+
+	// For each old event...
+	outer: while (newEvents.length) {
+		const newe = newEvents[0]
+		// Find a new event to pair it with...
+		let handled = false
+		for (let i = 0; i < oldEventRows.length; i++) {
+			const olde = oldEventRows[i]
+			if (olde.event_type === newe.$type && olde.event_subtype === (newe.msgtype || null)) {
+				// Found one!
+				// Set up the pairing
+				eventsToReplace.push({
+					old: olde,
+					new: newe
+				})
+				// These events have been handled now, so remove them from the source arrays
+				newEvents.shift()
+				oldEventRows.splice(i, 1)
+				// Go all the way back to the start of the next iteration of the outer loop
+				continue outer
+			}
+		}
+		// If we got this far, we could not pair it to an existing event, so it'll have to be a new one
+		eventsToSend.push(newe)
+		newEvents.shift()
+	}
+	// Anything remaining in oldEventRows is present in the old version only and should be redacted.
+	eventsToRedact = oldEventRows
+
+	// Now, everything in eventsToSend and eventsToRedact is a real change, but everything in eventsToReplace might not have actually changed!
+	// (Consider a MESSAGE_UPDATE for a text+image message - Discord does not allow the image to be changed, but the text might have been.)
+	// So we'll remove entries from eventsToReplace that *definitely* cannot have changed. Everything remaining *may* have changed.
+	eventsToReplace = eventsToReplace.filter(ev => {
+		// Discord does not allow files, images, attachments, or videos to be edited.
+		if (ev.old.event_type === "m.room.message" && ev.old.event_subtype !== "m.text" && ev.old.event_subtype !== "m.emote") {
+			return false
+		}
+		// Discord does not allow stickers to be edited.
+		if (ev.old.event_type === "m.sticker") {
+			return false
+		}
+		// Anything else is fair game.
+		return true
+	})
+
+	return {eventsToReplace, eventsToRedact, eventsToSend}
+}
+
+module.exports.editMessage = editMessage
diff --git a/d2m/discord-client.js b/d2m/discord-client.js
index 91682bd..5e90d85 100644
--- a/d2m/discord-client.js
+++ b/d2m/discord-client.js
@@ -14,7 +14,7 @@ class DiscordClient {
 	 * @param {string} discordToken
 	 * @param {boolean} listen whether to set up the event listeners for OOYE to operate
 	 */
-	constructor(discordToken, listen) {
+	constructor(discordToken, listen = true) {
 		this.discordToken = discordToken
 		this.snow = new SnowTransfer(discordToken)
 		this.cloud = new CloudStorm(discordToken, {
@@ -44,7 +44,9 @@ class DiscordClient {
 		this.guilds = new Map()
 		/** @type {Map<string, Array<string>>} */
 		this.guildChannelMap = new Map()
-		this.cloud.on("event", message => discordPackets.onPacket(this, message))
+		if (listen) {
+			this.cloud.on("event", message => discordPackets.onPacket(this, message))
+		}
 		this.cloud.on("error", console.error)
 	}
 }
diff --git a/scripts/capture-message-update-events.js b/scripts/capture-message-update-events.js
new file mode 100644
index 0000000..2ff9b49
--- /dev/null
+++ b/scripts/capture-message-update-events.js
@@ -0,0 +1,51 @@
+// @ts-check
+
+// ****
+const interestingFields = ["author", "content", "edited_timestamp", "mentions", "attachments", "embeds", "type", "message_reference", "referenced_message", "sticker_items"]
+// *****
+
+function fieldToPresenceValue(field) {
+	if (field === undefined) return 0
+	else if (field === null) return 1
+	else if (Array.isArray(field) && field.length === 0) return 10
+	else if (typeof field === "object" && Object.keys(field).length === 0) return 20
+	else if (field === "") return 30
+	else return 99
+}
+
+const sqlite = require("better-sqlite3")
+const HeatSync = require("heatsync")
+
+const config = require("../config")
+const passthrough = require("../passthrough")
+
+const sync = new HeatSync({watchFS: false})
+
+Object.assign(passthrough, {config, sync})
+
+const DiscordClient = require("../d2m/discord-client", false)
+
+const discord = new DiscordClient(config.discordToken, false)
+passthrough.discord = discord
+
+;(async () => {
+	await discord.cloud.connect()
+	console.log("Discord gateway started")
+
+	const f = event => onPacket(discord, event, () => discord.cloud.off("event", f))
+	discord.cloud.on("event", f)
+})()
+
+const events = new sqlite("scripts/events.db")
+const sql = "INSERT INTO \"update\" (json, " + interestingFields.join(", ") + ") VALUES (" + "?".repeat(interestingFields.length + 1).split("").join(", ") + ")"
+console.log(sql)
+const prepared = events.prepare(sql)
+
+/** @param {DiscordClient} discord */
+function onPacket(discord, event, unsubscribe) {
+	if (event.t === "MESSAGE_UPDATE") {
+		const data = [JSON.stringify(event.d), ...interestingFields.map(f => fieldToPresenceValue(event.d[f]))]
+		console.log(data)
+		prepared.run(...data)
+	}
+}
diff --git a/scripts/events.db b/scripts/events.db
new file mode 100644
index 0000000..c8f5bad
Binary files /dev/null and b/scripts/events.db differ