Configs ID will eventually overflow

[leth]

As @marccarre observed in #827 (comment)
Our config IDs are represented as golang int but sourced from a postgreSQL serial which can reach 2147483647, which will overflow the int.

If unfixed, it will cause the ruler to reload more rules than necessary, and (if #827 is merged) cause out of date rules to be interleaved with new rules (#723).

This is unlikely to cause a problem anytime soon.

[stale]

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