[Tile-serving] [openstreetmap/osm2pgsql] Duplicated serial values when appending data to flex backend (#1522)

[Sarah Hoffmann]

To quote the [manual](https://osm2pgsql.org/doc/manual.html#defining-columns):

> The content of the sql_type field is not checked by osm2pgsql, it is passed on to PostgreSQL as is. Do not set this to anything else but a valid PostgreSQL type.

Adding constraints to `sql_type` is not supported.

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