update published TODO before release

TODO.txt

@@ -8,8 +8,7 @@ reading concepts, and provides processing multiple sections at a
 time. Please test if you're interrested.
 
 Current status::
-    Wait for user complaints, get a version at
-    http://pgloader.projects.postgresql.org/dev/[].
+   Released in pgloader +2.3.0+.
 
 Limits::
    See http://docs.python.org/api/threads.html[], and consider
@@ -17,9 +16,6 @@ Limits::
    huga as to completely inhibit any performance benefit from
    multi-threaded processing.
 
-Version::
-   +2.3.0+, currently in +~dev2+, which could be read 'Release Candidate'.
-
 == Constraint Exclusion support ==
 
 Current status::
@@ -140,6 +136,32 @@ configure them depending on the error we had. For example user might
 configure pgloader to load rejected data to some other table when the
 error is PK violation.
 
+=== Offload to error table
+
+This is a design idea where we add a new configuration parameter to
++pgloader+, namely +errors_table+. Then +pgloader+ will create the
+table with the given name as following:
+
+  CREATE TABLE mysection_errors (
+    id bigserial PRIMARY KEY,
+    first_line   bigint not null,
+    last_line    bigint,
+    sqlstate     text,
+    message      text,
+    hint         text,
+    context      text,
+    data         bytea
+  );
+
+The lines number are intended to represent input file physical line
+numbers, +last_line+ being +NULL+ when input files do not contain line
+breaks.
+
+At the implementation level, it migth be a good idea to use
++SAVEPOINTS+ (see
+http://www.postgresql.org/docs/8.3/static/sql-savepoint.html[])
+instead of plain transactions.
+
 == Fixed Format ==
 
 Current status::