fix: use 'client output queue' terminology consistently

Replace ambiguous 'queue' with 'client output queue' throughout
documentation, code comments, log messages, and error strings
added in the queue pruning PR.

README.md

@@ -249,8 +249,8 @@ Key properties:
 - **Ordered**: Queue entries have monotonically increasing IDs. Messages are
   always delivered in order within a client's queue.
 - **No delivery/read receipts** for channel messages. DM receipts are planned.
-- **Queue depth**: Server-configurable via `QUEUE_MAX_AGE`. Default is 30
-  days. Entries older than this are pruned.
+- **Client output queue depth**: Server-configurable via `QUEUE_MAX_AGE`.
+  Default is 30 days. Entries older than this are pruned.
 
 ### Long-Polling
 
@@ -1790,8 +1790,8 @@ skew issues) and simpler than UUIDs (integer comparison vs. string comparison).
 
 - **Messages**: Pruned automatically when older than `MESSAGE_MAX_AGE`
   (default 30 days).
-- **Queue entries**: Pruned automatically when older than `QUEUE_MAX_AGE`
-  (default 30 days).
+- **Client output queue entries**: Pruned automatically when older than
+  `QUEUE_MAX_AGE` (default 30 days).
 - **Channels**: Deleted when the last member leaves (ephemeral).
 - **Users/sessions**: Deleted on `QUIT` or `POST /api/v1/logout`. Idle
   sessions are automatically expired after `SESSION_IDLE_TIMEOUT` (default
@@ -1814,7 +1814,7 @@ directory is also loaded automatically via
 | `DEBUG`            | bool    | `false`                              | Enable debug logging (verbose request/response logging) |
 | `MESSAGE_MAX_AGE`  | string  | `720h`                               | Maximum age of messages as a Go duration string (e.g. `720h`, `24h`). Messages older than this are pruned. Default is 30 days. |
 | `SESSION_IDLE_TIMEOUT` | string | `720h`                           | Session idle timeout as a Go duration string (e.g. `720h`, `24h`). Sessions with no activity for this long are expired and the nick is released. Default is 30 days. |
-| `QUEUE_MAX_AGE`    | string  | `720h`                               | Maximum age of client queue entries as a Go duration string (e.g. `720h`, `24h`). Entries older than this are pruned. Default is 30 days. |
+| `QUEUE_MAX_AGE`    | string  | `720h`                               | Maximum age of client output queue entries as a Go duration string (e.g. `720h`, `24h`). Entries older than this are pruned. Default is 30 days. |
 | `MAX_MESSAGE_SIZE` | int     | `4096`                               | Maximum message body size in bytes (planned enforcement) |
 | `LONG_POLL_TIMEOUT`| int     | `15`                                 | Default long-poll timeout in seconds (client can override via query param, server caps at 30) |
 | `MOTD`             | string  | `""`                                 | Message of the day, shown to clients via `GET /api/v1/server` |
@@ -2228,7 +2228,7 @@ GET /api/v1/challenge
 ### Post-MVP (Planned)
 
 - [ ] **Hashcash proof-of-work** for session creation (abuse prevention)
-- [x] **Queue pruning** — delete old queue entries per `QUEUE_MAX_AGE`
+- [x] **Client output queue pruning** — delete old client output queue entries per `QUEUE_MAX_AGE`
 - [x] **Message rotation** — prune messages older than `MESSAGE_MAX_AGE`
 - [ ] **Channel modes** — enforce `+i`, `+m`, `+s`, `+t`, `+n`
 - [ ] **User channel modes** — `+o` (operator), `+v` (voice)

internal/db/queries.go

@@ -1110,8 +1110,8 @@ func (database *Database) GetSessionCreatedAt(
 	return createdAt, nil
 }
 
-// PruneOldQueueEntries deletes client_queues rows older
-// than cutoff and returns the number of rows removed.
+// PruneOldQueueEntries deletes client output queue entries
+// older than cutoff and returns the number of rows removed.
 func (database *Database) PruneOldQueueEntries(
 	ctx context.Context,
 	cutoff time.Time,
@@ -1122,7 +1122,7 @@ func (database *Database) PruneOldQueueEntries(
 	)
 	if err != nil {
 		return 0, fmt.Errorf(
-			"prune old queue entries: %w", err,
+			"prune old client output queue entries: %w", err,
 		)
 	}
 

internal/handlers/handlers.go

@@ -226,8 +226,9 @@ func (hdlr *Handlers) parseDurationConfig(
 	return dur
 }
 
-// pruneQueuesAndMessages removes old client_queues entries
-// per QUEUE_MAX_AGE and prunes messages per MESSAGE_MAX_AGE.
+// pruneQueuesAndMessages removes old client output queue
+// entries per QUEUE_MAX_AGE and old messages per
+// MESSAGE_MAX_AGE.
 func (hdlr *Handlers) pruneQueuesAndMessages(
 	ctx context.Context,
 ) {
@@ -242,11 +243,11 @@ func (hdlr *Handlers) pruneQueuesAndMessages(
 			PruneOldQueueEntries(ctx, queueCutoff)
 		if err != nil {
 			hdlr.log.Error(
-				"queue pruning failed", "error", err,
+				"client output queue pruning failed", "error", err,
 			)
 		} else if pruned > 0 {
 			hdlr.log.Info(
-				"pruned old queue entries",
+				"pruned old client output queue entries",
 				"deleted", pruned,
 			)
 		}