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I have a LineString table in PostGIS, which represents wiring in streets. Where the geometry column represents the wiring lines; firstpoint is the first geometry point (cable segment); lastpoint the last geometry point; id_startpoint and id_enpoint are identifiers of the firstpoint and lastpoint columns.

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In OpenLayers v5 it is shown as follows:

Tabla Line en PostGIS

The point is that I want to detect the rings (cycles) in the structure of the network. As shown below:

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My solution was to use the DFS algorithm in javascript to detect cycles in undirected graphs, which works well until I give the 5327 registers (too much data), however with 200 registers it works fine. For this reason, I want to use some PostGIS function to find the cycles. You could recommend some function to me since there is ST_NumInteriorRings and ST_ExteriorRing but they are for polygons, I need a function for LineString.

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