diff --git a/keyserver/src/cron/metrics.js b/keyserver/src/cron/metrics.js
index 5f7eda6c9..0f040da2e 100644
--- a/keyserver/src/cron/metrics.js
+++ b/keyserver/src/cron/metrics.js
@@ -1,148 +1,168 @@
 // @flow
 
 import bots from 'lib/facts/bots.js';
 import { messageTypes } from 'lib/types/message-types-enum.js';
 
 import createMessages from '../creators/message-creator.js';
 import { dbQuery, SQL } from '../database/database.js';
 import { createScriptViewer } from '../session/scripts.js';
 
 const metricsChannel = '80820870';
 const millisecondsPerDay = 24 * 60 * 60 * 1000;
 
 async function postMetrics() {
   if (!process.env.RUN_COMM_TEAM_DEV_SCRIPTS) {
     // This is a job that the Comm internal team uses
     return;
   }
 
   const oneDayAgo = Date.now() - millisecondsPerDay;
+  const oneWeekAgo = Date.now() - millisecondsPerDay * 7;
   const thirtyDaysAgo = Date.now() - millisecondsPerDay * 30;
   const [
     dailyActives,
     monthlyActives,
     lastDayOneWeekRetention,
     lastDayTwoWeekRetention,
     lastWeekThreeWeekRetention,
     lastDayRetentionSinceLaunch,
     lastWeekRetentionSinceLaunch,
+    dailyUniqueMessageAuthors,
+    weeklyUniqueMessageAuthors,
+    monthlyUniqueMessageAuthors,
   ] = await Promise.all([
     getActiveCountSince(oneDayAgo),
     getActiveCountSince(thirtyDaysAgo),
     getRetention(7, 6, 1),
     getRetention(14, 13, 1),
     getRetention(21, 14, 7),
     getRetentionSinceLaunch(1),
     getRetentionSinceLaunch(7),
+    getUniqueMessageAuthorCountSince(oneDayAgo),
+    getUniqueMessageAuthorCountSince(oneWeekAgo),
+    getUniqueMessageAuthorCountSince(thirtyDaysAgo),
   ]);
 
   const metrics = {
     'DAUs': dailyActives,
     'MAUs': monthlyActives,
     'D7 (daily)': lastDayOneWeekRetention,
     'D14 (daily)': lastDayTwoWeekRetention,
     'D21 (weekly)': lastWeekThreeWeekRetention,
     'daily retention since launch': lastDayRetentionSinceLaunch,
     'weekly retention since launch': lastWeekRetentionSinceLaunch,
+    'unique message authors (daily)': dailyUniqueMessageAuthors,
+    'unique message authors (weekly)': weeklyUniqueMessageAuthors,
+    'unique message authors (monthly)': monthlyUniqueMessageAuthors,
   };
   const today = new Date().toLocaleString('default', {
     day: 'numeric',
     month: 'long',
     year: 'numeric',
   });
   const metricText =
     `### Metrics for ${today}\n` +
     '```\n' +
     `${JSON.stringify(metrics, undefined, 2)}\n` +
     '```';
 
   const viewer = createScriptViewer(bots.commbot.userID);
   const messageDatas = [
     {
       type: messageTypes.TEXT,
       threadID: metricsChannel,
       creatorID: bots.commbot.userID,
       time: Date.now(),
       text: metricText,
     },
   ];
   await createMessages(viewer, messageDatas);
 }
 
 async function getActiveCountSince(time: number): Promise<number> {
   const [result] = await dbQuery(SQL`
     SELECT COUNT(DISTINCT u.id) AS count
     FROM users u
     LEFT JOIN cookies c ON c.user = u.id
-    WHERE last_used IS NOT NULL AND last_used > ${time}
+    WHERE last_used IS NOT NULL AND last_used >= ${time}
   `);
   const [row] = result;
   return row.count;
 }
 
 // Of the users that created their account between N and M days ago,
 // how many were active in the last X days?
 type RetentionResult = { +retainedCount: number, +totalCount: number };
 async function getRetention(
   registeredDaysAgoStart: number,
   registeredDaysAgoEnd: number,
   activityCheckDaysAgo: number,
 ): Promise<RetentionResult> {
   const startOfRegistrationPeriod =
     Date.now() - millisecondsPerDay * registeredDaysAgoStart;
   const endOfRegistrationPeriod =
     Date.now() - millisecondsPerDay * registeredDaysAgoEnd;
   const [result] = await dbQuery(SQL`
     SELECT u.id, MAX(c.last_used) AS lastUsed
     FROM users u
     LEFT JOIN cookies c ON c.user = u.id
     WHERE u.creation_time >= ${startOfRegistrationPeriod}
       AND u.creation_time < ${endOfRegistrationPeriod}
     GROUP BY u.id
   `);
 
   const totalCount = result.length;
 
   const lastUsedSince = Date.now() - millisecondsPerDay * activityCheckDaysAgo;
   const retainedCount = result.filter(
-    ({ lastUsed }) => lastUsed > lastUsedSince,
+    ({ lastUsed }) => lastUsed >= lastUsedSince,
   ).length;
 
   return { retainedCount, totalCount };
 }
 
 // We're measuring users that signed up in the 7 days following launch.
 // They count as retained if they've used Comm in the last activityCheckDaysAgo
 // days.
 async function getRetentionSinceLaunch(
   activityCheckDaysAgo: number,
 ): Promise<RetentionResult> {
   const launchDate = new Date('2024-10-03');
   const launchDaysAgo = Math.ceil(
     (Date.now() - launchDate.getTime()) / millisecondsPerDay,
   );
 
   const retentionPromises: Array<Promise<RetentionResult>> = [];
   for (let i = 0; i < 7; i++) {
     retentionPromises.push(
       getRetention(
         launchDaysAgo - i,
         launchDaysAgo - i - 1,
         activityCheckDaysAgo,
       ),
     );
   }
 
   const totalRetentionResults = {
     retainedCount: 0,
     totalCount: 0,
   };
   const retentionResults = await Promise.all(retentionPromises);
   for (const retentionResult of retentionResults) {
     totalRetentionResults.retainedCount += retentionResult.retainedCount;
     totalRetentionResults.totalCount += retentionResult.totalCount;
   }
   return totalRetentionResults;
 }
 
+async function getUniqueMessageAuthorCountSince(time: number): Promise<number> {
+  const [result] = await dbQuery(SQL`
+    SELECT COUNT(DISTINCT user) AS count
+    FROM messages
+    WHERE time >= ${time}
+  `);
+  const [row] = result;
+  return row.count;
+}
+
 export { postMetrics };