Chore/int to bigint investigations

administration/int-bigint-investigations/explore_amount_free.sql

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+-- Credit: https://www.reddit.com/r/PostgreSQL/comments/xq7334/comment/iq8ln9o/
+SELECT
+    sequencename,
+    max_value,
+    last_value,
+    (max_value - last_value) AS remaining,
+    ((max_value - last_value) * 100.0 / max_value) AS pct_free
+FROM
+    pg_sequences
+ORDER BY
+    pct_free ASC;

administration/int-bigint-investigations/explore_int_pk_tables.sql

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+
+-- pg_constraint docs
+-- https://www.postgresql.org/docs/current/catalog-pg-constraint.html
+-- contype char
+-- c = check constraint, f = foreign key constraint, n = not-null constraint (domains only), p = primary key constraint, u = unique constraint, t = constraint trigger, x = exclusion constraint
+
+SELECT
+    n.nspname AS table_schema,
+    c.relname AS table_name,
+    a.attname AS column_name,
+    pg_catalog.format_type(a.atttypid, a.atttypmod) AS data_type,
+    c.reltuples::numeric AS estimate
+FROM
+    pg_catalog.pg_constraint con
+    JOIN pg_catalog.pg_class c ON con.conrelid = c.oid
+    JOIN pg_catalog.pg_namespace n ON c.relnamespace = n.oid
+    JOIN pg_catalog.pg_attribute a ON a.attnum = ANY (con.conkey)
+        AND a.attrelid = c.oid
+WHERE
+    con.contype = 'p' -- Primary key constraint
+    AND n.nspname NOT IN ('pg_catalog', 'information_schema') -- Exclude system schemas
+    AND pg_catalog.format_type(a.atttypid, a.atttypmod) = 'integer'::text
+ORDER BY
+    5 DESC;