Enables STRICT tables in developer mode, but old databases (~2019) may
have BLOB values in TEXT columns. Migration converts BLOB faildetail
to TEXT with UTF-8 validation, NULLs invalid data.
STRICT is only applied to fresh databases; existing databases being
upgraded skip STRICT to avoid type affinity issues with legacy data.
Also adds security pragmas in developer mode: trusted_schema=OFF,
cell_size_check=ON.
Fixes#5390.
Changelog-Added: Database: STRICT tables and security pragmas in developer mode
Changelog-Fixed: Database migration for old BLOB-typed faildetail values
f318c13bf5