[openstreetmap/openstreetmap-website] Use activerecord-import for bulk importing tracepoint records (#2131)

[Tom Hughes]

As far as memory goes, the largest trace we have seems to have about fifteen million points, which raises a few issues - both memory as you say but also the size of the SQL if they are all inserted in one go!

Maybe we should do them in batches of a thousand or something?

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