Remove the longest edge bounding faces with area < 0.1:

WITH small_faces AS (
SELECT face.face_id
FROM small_sample_topo.face
WHERE face.face_id > 0
AND st_area(st_getfacegeometry(‘small_sample_topo’::character varying, face.face_id)) < 0.1
), alldata AS (
SELECT f.face_id, e.edge_id, st_length(e.geom),
max(st_length(e.geom)) over (partition by f.face_id) as mlen
FROM small_sample_topo.edge_data e, small_faces f
WHERE e.left_face = f.face_id or e.right_face = f.face_id
)
SELECT st_remedgemodface(‘small_sample_topo’, edge_id)
FROM alldata WHERE st_length = mlen;

Drop dangling edges:

SELECT st_remedgemodface(‘small_sample_topo’, edge_id)
FROM small_sample_topo.edge_data
WHERE left_face = right_face;

Remove isolated nodes:

SELECT st_remisonode(‘small_sample_topo’, node_id)
FROM small_sample_topo.node
WHERE containing_face is not null;

Something analogous to ArcSomething topology tools: a (1) topology layer (in memory or else), where we can define the intervening layers/postgis tables, (2) rules (overlaps, gaps, covers, contains), (3) a list of errors, and (4) tools to merge/subtract/create feature/mark as exception or error.

This would a plus (++++) if created. Add this to (fast) raster reprojection and good cartographic production tools and say good bye to proprietary software.

This is a great news.
Congratulations!

I’m not sure the GRASS toolbar would be appropriate for PostGIS topology editing.
A toolbar oriented toward ISO SQL/MM editing functions would allow:
adding an isolated node, adding an edge, splitting an edge, modifying an edge, removing an edge, removing a node. Topologies constructed through such functions would always be valid as invalidity would be caught by the functions themselves.

Such editing would need to be in sync with DB in order to make use of the functions, so would benefit from some locking and possibly versioning support.

I guess the next step here would be drafting design on a qgis wiki page…

What kind of management features would you like to see exposed ?