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Parsed test spec with 3 sessions
starting permutation: s1a s2a s3a s1b s2b s3b
step s1a: SELECT * FROM queue ORDER BY id FOR UPDATE LIMIT 1;
id data status
1 foo NEW
step s2a: SELECT * FROM queue ORDER BY id FOR UPDATE LIMIT 1; <waiting ...>
step s3a: SELECT * FROM queue ORDER BY id FOR UPDATE SKIP LOCKED LIMIT 1;
id data status
2 bar NEW
step s1b: COMMIT;
step s2a: <... completed>
id data status
1 foo NEW
step s2b: COMMIT;
step s3b: COMMIT;
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