X-Git-Url: http://git.cyclocoop.org/?a=blobdiff_plain;f=maintenance%2Ftables.sql;h=4307c0c71132edc8131ff0ff5a1e0879c014fe40;hb=cf0872c783946242698bfaf9bd134d503fc393fc;hp=97d6ff20f7e9d41ac5967158bb156fd387ee94e5;hpb=7027ba7e935d11a0bd1fd0ee49d7ba7e2bdcfd22;p=lhc%2Fweb%2Fwiklou.git

diff --git a/maintenance/tables.sql b/maintenance/tables.sql
index 97d6ff20f7..4307c0c711 100644
--- a/maintenance/tables.sql
+++ b/maintenance/tables.sql
@@ -86,10 +86,12 @@ CREATE TABLE /*_*/user (
   -- Same with passwords.
   user_email tinytext NOT NULL,
 
-  -- This is a timestamp which is updated when a user
-  -- logs in, logs out, changes preferences, or performs
-  -- some other action requiring HTML cache invalidation
-  -- to ensure that the UI is updated.
+  -- If the browser sends an If-Modified-Since header, a 304 response is
+  -- suppressed if the value in this field for the current user is later than
+  -- the value in the IMS header. That is, this field is an invalidation timestamp
+  -- for the browser cache of logged-in users. Among other things, it is used
+  -- to prevent pages generated for a previously logged in user from being
+  -- displayed after a session expiry followed by a fresh login.
   user_touched binary(14) NOT NULL default '',
 
   -- A pseudorandomly generated value that is stored in
@@ -560,10 +562,10 @@ CREATE UNIQUE INDEX /*i*/cl_from ON /*_*/categorylinks (cl_from,cl_to);
 -- callers won't be using an index: fix this?
 CREATE INDEX /*i*/cl_sortkey ON /*_*/categorylinks (cl_to,cl_type,cl_sortkey,cl_from);
 
--- Not really used?
+-- Used by the API (and some extensions)
 CREATE INDEX /*i*/cl_timestamp ON /*_*/categorylinks (cl_to,cl_timestamp);
 
--- For finding rows with outdated collation
+-- FIXME: Not used, delete this
 CREATE INDEX /*i*/cl_collation ON /*_*/categorylinks (cl_collation);
 
 --