Fix levels 51–54 wrongly placed in Expert epoch#14
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Levels 51–54 (Maritime Trade Finance intro, difficulty 2–3) were
marked epoch:'Expert' but sandwiched between Expert difficulty-4
banking levels (41–50) and Expert difficulty-4 maritime levels
(55–63), creating a jarring difficulty regression.
Fix: renumber so the maritime intro levels come before the Expert
banking levels in the sequence:
- Old 51–54 → New 41–44, epoch changed to 'Advanced'
- Old 41–50 → New 45–54, epoch unchanged ('Expert')
- 55–63 unchanged
Both catalog-integrity test constraints (contiguous epochs in order,
sequential IDs) continue to pass. LevelUpModal hint boundaries
updated to match the new epoch boundaries (40, 44, 54).
Fixes #9
https://claude.ai/code/session_01TkxyEqFBuqRCvRAzRLPEbs
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Summary
Fixes #9 — levels 51–54 (Maritime Trade Finance intro) were marked
epoch: 'Expert'despite havingdifficulty: 2–3, sandwiching much easier levels between Expert difficulty-4 banking levels (41–50) and Expert difficulty-4 maritime levels (55–63).epochto'Advanced'— these introductory maritime levels (simple SELECT, JOIN, basic CTE + RANK) now live at the end of the Advanced section where their difficulty belongsepoch: 'Expert'— the complex banking CTEs/window-function levels shift up by 4LevelUpModalhint boundaries to match new epoch edges (40, 44, 54)Test plan
npm test— all 278 tests pass (catalog integrity: contiguous epochs in order, sequential IDs; all 63 solution queries execute correctly)npm run typecheck— no TypeScript errorshttps://claude.ai/code/session_01TkxyEqFBuqRCvRAzRLPEbs
Generated by Claude Code