diff --git a/src/wormhole/db-schemas/v1.sql b/src/wormhole/db-schemas/v1.sql
index 82bdfe9..7dba360 100644
--- a/src/wormhole/db-schemas/v1.sql
+++ b/src/wormhole/db-schemas/v1.sql
@@ -21,14 +21,17 @@ CREATE INDEX `messages_idx` ON `messages` (`appid`, `channelid`);
 
 CREATE TABLE `usage`
 (
+ `type` VARCHAR, -- "rendezvous"
  `started` INTEGER, -- seconds since epoch, rounded to one day
  `result` VARCHAR, -- happy, scary, lonely, errory, pruney
- -- "happy": both sides close with mood=happy
- -- "scary": any side closes with mood=scary (bad MAC, probably wrong pw)
- -- "lonely": any side closes with mood=lonely (no response from 2nd side)
- -- "errory": any side closes with mood=errory (other errors)
- -- "pruney": channels which get pruned for inactivity
- -- "crowded": three or more sides were involved
+ -- rendezvous moods:
+ --  "happy": both sides close with mood=happy
+ --  "scary": any side closes with mood=scary (bad MAC, probably wrong pw)
+ --  "lonely": any side closes with mood=lonely (no response from 2nd side)
+ --  "errory": any side closes with mood=errory (other errors)
+ --  "pruney": channels which get pruned for inactivity
+ --  "crowded": three or more sides were involved
+ `total_bytes` INTEGER, -- not yet used
  `total_time` INTEGER, -- seconds from start to closed, or None
  `waiting_time` INTEGER -- seconds from start to 2nd side appearing, or None
 );
diff --git a/src/wormhole/servers/cmd_usage.py b/src/wormhole/servers/cmd_usage.py
index 78eec21..202a75e 100644
--- a/src/wormhole/servers/cmd_usage.py
+++ b/src/wormhole/servers/cmd_usage.py
@@ -32,8 +32,9 @@ def show_usage(args):
     newest = None
     counters = defaultdict(int)
     db = get_db("relay.sqlite")
-    c = db.execute("SELECT * FROM `usage` ORDER BY `started` ASC LIMIT ?",
-                   (args.n,))
+    c = db.execute("SELECT * FROM `usage` WHERE `type`=?"
+                   " ORDER BY `started` ASC LIMIT ?",
+                   (u"rendezvous", args.n))
     for row in c.fetchall():
         counters["total"] += 1
         counters[row["result"]] += 1
@@ -65,8 +66,9 @@ def tail_usage(args):
     seen = set()
     while True:
         old = time.time() - 2*60*60
-        c = db.execute("SELECT * FROM `usage` WHERE `started` > ?"
-                       " ORDER BY `started` ASC", (old,))
+        c = db.execute("SELECT * FROM `usage`"
+                       " WHERE `type`=? AND `started` > ?"
+                       " ORDER BY `started` ASC", (u"rendezvous", old))
         for row in c.fetchall():
             event = (row["started"], row["result"],
                      row["waiting_time"], row["total_time"])
diff --git a/src/wormhole/servers/relay_server.py b/src/wormhole/servers/relay_server.py
index 0dda261..c520466 100644
--- a/src/wormhole/servers/relay_server.py
+++ b/src/wormhole/servers/relay_server.py
@@ -298,9 +298,11 @@ class Channel:
     def _store_summary(self, summary):
         (started, result, total_time, waiting_time) = summary
         self._db.execute("INSERT INTO `usage`"
-                         " (`started`, `result`, `total_time`, `waiting_time`)"
-                         " VALUES (?,?,?,?)",
-                         (started, result, total_time, waiting_time))
+                         " (`type`, `started`, `result`,"
+                         "  `total_time`, `waiting_time`)"
+                         " VALUES (?,?,?, ?,?)",
+                         (u"rendezvous", started, result,
+                          total_time, waiting_time))
         self._db.commit()
 
     def _summarize(self, messages, delete_time):