Building for the first time:

cabal sandbox init

cabal update

cabal install happy

cabal install --only-dependencies

cabal configure

cabal build

Later, only cabal build is required to rebuild when files have changed.

If dependencies or project structure has changed then

cabal install --only-dependencies

cabal configure

cabal build

may be necessary.

After building, the executable can be run with dist/build/sqla/sqla