feat(t2): add storage parameters (reloptions) query

[NikolayS]

Summary

Rebased version of #73 — adds new t2 query to audit objects with custom storage parameters.

What it shows

• All tables, indexes, materialized views with non-default reloptions
• Object type, size, individual storage parameter settings
• Partition relationships (shows parent table)
• Warnings for potentially problematic settings:
  • ⚠️ Autovacuum disabled on tables > 10 MiB
  • Low fillfactor (< 50%)
  • Aggressive autovacuum (very low scale factor)

Changes from original #73

• Fixed: header comment missing space after --
• Fixed: fillfactor regex matched 50 but note said "< 50%" — now correctly matches only 10-49
• Fixed: schema alias renamed to schema_name (avoid reserved word)
• Fixed: added as for table aliases per SQL style guide
• Fixed: missing newline at EOF
• Fixed: start.psql no longer silently drops c1 (original PR was branched before c1 existed)

Testing

• Tested locally on PostgreSQL 17
• Verified fillfactor boundary: 49 → warning, 50 → no warning, 51 → no warning

Supersedes #73
Closes #61

[tembo]

c.reloptions doesn’t look used outside the CTE (you already unnest() it). Dropping it avoids carrying the full array around.

Suggested change

	c.reloptions,
	unnest(c.reloptions) as option,
	unnest(c.reloptions) as option,

[tembo]

parent_table is only meaningful for partitions; computing this subquery for every row adds overhead, and on inherited (non-partition) tables it can error if multiple parents exist. Making it conditional (and adding a defensive limit 1) keeps the query robust.

Suggested change

	c.relispartition,
	(select n2.nspname || '.' || c2.relname
	from pg_inherits as inh
	join pg_class as c2 on inh.inhparent = c2.oid
	join pg_namespace as n2 on c2.relnamespace = n2.oid
	where inh.inhrelid = c.oid
	) as parent_table
	c.relispartition,
	case
	when c.relispartition then (
	select
	n2.nspname || '.' || c2.relname
	from pg_inherits as inh
	inner join pg_class as c2
	on inh.inhparent = c2.oid
	inner join pg_namespace as n2
	on c2.relnamespace = n2.oid
	where inh.inhrelid = c.oid
	limit 1
	)
	else null
	end as parent_table