Changelog

0.9.5

version jump to indicate this version will break existing code (I really didn't want to do this, but there are a lot of advantages. And I've decided to put all the proposed breaking changes into a single version jump to simplify upgrades)
The upgrade script is able to upgrade all the managed tables and functions, but you'll have to modify your code
now requires PostgreSQL 9.2 or newer (due to the usage of range types)
Added schema support:
- The extension itself has been moved to the recall schema (and the recall_ prefix has been removed)
- _log and _tpl tables will now be placed into the recall schema (to help keeping table listings cleaner)
- recall.enable() added an optional tgtSchema parameter (defaults to recall) specifying where the _log and _tpl tables will be stored.
- recall.enable() prepends the data table's schema to the _tpl and _log table's names unless the data table is in public (or matches tgtSchema).
  So recall.enable('abc.foo', 'some interval', 'abc') creates abc.foo_log, while recall.enable('abc.foo', 'some interval') creates `recall.abc__foo_log')
The now() issue has been fixed (The trigger function is now able to update
candidate for 1.0

Under the hood:

replaced the two timestamptz columns in log tables with the single column _log_time of type tstzrange
The OIDs of the _log and _tpl tables are now stored to recall._config, so you can move the tables (pg_recall will still find them)
Added a no-overlap constraint to the _log tables. The resulting GiST index replaces the primary key (used up until now).
The GiST index allows fast lookups based on key, timestamps or both (also speeds up the cleanup() process)
Added a CHECK constraint preventing empty interval log entries (which could mess up querying)

When updating:

The extension still shows up to be installed into the public schema (when listing extensions e.g. using \dx in psql) even though everything's in the recall schema (there should be no practical differences between a fresh 0.9.5 installation and an upgraded one)
all your _log and _tpl tables will be moved to the recall schema (the update script assumes that they've been in the public schema before as there's no real schema support in previous versions)
replace all the function calls to any of the extension's functions
If you rely on the log tables to have private keys (e.g. if you want to reference the log table using a foreign key - for whatever reason), add them yourselve

fixed PostgreSQL 9.1 compatibility (by removing a call to 9.4's cardinality() function)
added recall_at()

only logging changes (i.e. checking if anything has changed and abort if it hasn't)