Martin wrote:
...
     Example (maybe via .read):
       .once .dat
       select date('now');
       .let f system echo "words-`cat .dat`.txt"
       .once -let f
       select word from words order by 1;
..

Sorry for replying only to this single point. The proposed ".let" command is not essential here. As a student I was impressed by the SNOBOL programming language because it allowed "dynamic code generation" (writing before the foot). From the SQLite command line this works too:

 .once tmp1.sql
values ('.once words.' || date() || '.dat'),
           ('select * from words;');
sqlite> .read tmp1.sql


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