Seven cases wrote straight into the shared table and told their rows
apart by a call_id prefix. Reading was never the problem; the prefix
did that correctly, and it was built for concurrent runs. What it could
not do was stop those writes and deletes from moving a row count that
another test was watching, which is how issue #18 turned red.
They now write into sandbox schemas, which also ends the orphan rows a
killed run used to leave in there. Six fixtures collapse into factory
calls; what they yield is unchanged, so the cases that consume them did
not have to be touched, which is what makes them worth anything as a
check on the move.
Two of the seven kept something. The pool footprint case needs a unique
application_name, since connections are an instance-wide resource that
schema isolation does not reach, so it generates its own uuid instead
of borrowing the run prefix. And the frozen-columns case was querying
information_schema without a schema filter, so any leftover table of
the same name anywhere in the database could fail it: the file already
knew this, in a comment explaining why another fixture cleans up so
carefully. It now filters, and gets checked against a leftover table
planted on purpose.
The gate that keeps the literal out of tests/ is a smoke alarm, not
proof. Concatenation and parameterised queries walk straight past it.
The isolation is the factory withholding the admin connection and the
script running as a role with no grant.
iomgaa
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