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Originally Posted by DavidY I'm not sure it's that simple ... |
OK, it's not that simple, but on each post in the database there is a boolean field which says whether to include the poster's signature or not. Whether you see a signature is based on this flag. What causes this flag to be set may vary over time... Either way, old signatures are not recorded, so you'll only ever see the latest version.
(Way, way back signatures might have been included as part of the post, rather than as a flag, but I don't see any evidence of this.)