On the http://spatialreference.org, for almost all SRS are definied WGS84 Bounds and Projected Bounds.
How to obtain this bounds from postgis? Spatial_ref_sys does not contains this information.
Answer
You'll have to download the EPSG database and pull the information you want from it. They do provide PostgreSQL-compatible downloads. http://www.epsg.org/DownloadDataset
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