feat: update changelog for v0.2.16 release with new features and improvements

docs/changelog/index.md

@@ -4,6 +4,7 @@ Release history for EchoHub.
 
 ## Releases
 
+- [v0.2.16](v0.2.16.md) - Periodic Server-Stats Report, Upload & Moderation Logging & Quieter Connection Logs
 - [v0.2.15](v0.2.15.md) - Invite Codes, Data Export & Deletion, /me, /banner, Replies, Open Images In Browser & IRC Image Links
 - [v0.2.14](v0.2.14.md) - Clipboard Image & Multi-File Paste, E2E Room Unlock Fixes, Encrypted Key Cache & IRC Gateway Polish
 - [v0.2.13](v0.2.13.md) - Chat Visual Overhaul, Auto-Join All Channels & Persistent Read Positions

docs/changelog/toc.yml

@@ -1,5 +1,7 @@
 - name: Overview
   href: index.md
+- name: v0.2.16
+  href: v0.2.16.md
 - name: v0.2.15
   href: v0.2.15.md
 - name: v0.2.14

docs/changelog/v0.2.16.md

@@ -0,0 +1,43 @@
+# v0.2.16
+
+A logging and observability pass built on the new server-logs room. Busy servers stop drowning
+in connect/disconnect noise, the events operators actually care about — uploads, moderation
+actions — now get logged, and a new periodic report summarizes server activity as pretty-printed
+JSON that streams into the logs room and is saved to the database for history.
+
+## New Features
+
+- **Periodic server-stats report** — every 6 hours (configurable), the server logs an aggregate
+  activity snapshot as pretty-printed JSON and saves it to the database. Each report covers the
+  window since the previous one: messages sent, files uploaded (and total bytes), new members,
+  active members (distinct senders), session connections/disconnections, kicks, bans, total
+  registered members, users online now, and peak concurrent online. Reports also stream into the
+  live server-logs room, and old ones are pruned past a configurable retention. New `Stats` config
+  section (`Stats:Enabled`, `Stats:IntervalHours` = 6, `Stats:RetentionDays` = 90).
+- **Upload logging** — every file, image, and audio upload is now logged with its resource URL
+  (`/api/files/{id}`), kind, size, uploader, and channel. In end-to-end encrypted rooms the
+  filename is client-side ciphertext, so it's logged as `[encrypted]` — the server still never
+  sees room content.
+- **Moderation & user-action logging** — role changes, kicks, bans, unbans, mutes, unmutes,
+  moderator message removals, and channel nukes are now logged with the actor, target, and reason.
+  Bans and channel nukes log at Warning level so they stand out.
+
+## Improvements
+
+- **Quieter connection logs** — user connect, disconnect, join-channel, and leave-channel events
+  (over both SignalR and IRC) dropped from Information to Debug. On a busy server these fired
+  constantly and buried everything else; the aggregate counts now live in the periodic stats
+  report instead. They still show in Development, where the default level is Debug.
+- **Config examples stay in sync** — `.env.example` gained the `ServerLogs` and `Stats` sections
+  (the former had been missing), alongside `appsettings.json` / `appsettings.example.json`.
+
+## Notes for server operators
+
+- New config section: `Stats` — `Enabled` (default true), `IntervalHours` (default 6),
+  `RetentionDays` (default 90, `0` keeps reports forever). See `appsettings.example.json` and
+  `.env.example`. A non-positive interval falls back to 6h; positive values are honored down to a
+  1-second floor.
+- One new database migration (`AddServerStatsReports`) applies automatically on startup.
+- Connect/disconnect/join/leave now log at Debug — if you relied on those Information lines, lower
+  `Serilog:MinimumLevel:Default` (or `ServerLogs:MinLevel` for the room) to `Debug`, or read the
+  periodic stats report for aggregates.

src/Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <Version>0.2.15</Version>
+    <Version>0.2.16</Version>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
   </PropertyGroup>