update extid columns: varchar size limits, no char columns

In PostgreSQL, there is no query or size differences between CHAR,
VARCHAR, and TEXT: they use the same backend. CHAR will pad out with
spaces and VARCHAR enforces a size limit.

The enforced VARCHAR size limit seems like ok defensive
programming/schema here, preventing large values from getting stored for
some columns. I have some FUD concern about fixed-sized identifiers and
indexes, so switching old CHARs (eg, sha1 hex encoded columns) to
VARCHAR instead.

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