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+This folder contains several tools to use and parse the data from the app_acct.fdx extension.
+
+- database.sql :
+    An example database format for use with the scripts in this folder.
+    
+- app_acct.conf :
+    The part of app_acct.conf that is relevant to this database schema.
+
+- purge_to_file.php : 
+    This PHP script is used to take the records from the incoming table (stored by app_acct.fdx 
+  extension) and save these records in a file in SQL format. This is similar to pg_dump 
+  command, except that all the records that have been saved in the file are removed from 
+  the table. This can be used in cron jobs for example to maintain a reasonable size of 
+  the incoming table and move the data to another host for off-line processing. It can 
+  also be useful to aggregate the data from different hosts, if you are load-balancing your
+  accounting servers for example (granted that all app_acct.fdx use identical table format
+  on all the servers). See the top of the file for configuration parameters.
+    
+- process_records.php :
+    This PHP script processes the records pertaining to users sessions, as follow:
+  * when a session is complete (STOP record received), it stores a session summary
+  into the processed records table (see process_database.sql file for format). 
+  * It optionally archives the processed records into a different table, before deleting them.
+  * It can also move records of unterminated sessions that are older than a configurable time 
+  to an orphan_records table, so that they are not re-processed every time. 
+  This orphans table must have the same structure as the "incoming" table.
+  
+- display_results.php, display_self.php, display_stats.php :
+   These scripts give a few examples of how to display the processed data.
+  
+USAGE:
+ *) Initial: create your database using database.sql file
+ *) Configure the app_acct.fdx extension using tips from app_acct.conf
+
+  The following processing can be run for example as cron jobs.
+ 1) On each accounting server for the realm, configure the app_acct.fdx extension to
+   dump the records in a local database (all servers must use the same database format).
+   The table would typically be "incoming".
+ 2) Run the purge_to_file.php script on each server regularly, then move the generated
+   files onto a single server for processing. This server only needs the other tables.
+ 3) Add the data from the files into the database in this server by running:
+   psql < file.sql
+    Each file that has been added should then be archived and removed so that it is not 
+   re-added later.
+ 4) Run the process_records.php script on this processing server. Now, the database
+   contains the aggregated data that can be visualized with display_*.php scripts.
+