Delete committed dataset orphans (Track X)

[mmcky]

Deletes the ten committed data files no lecture in this repo has ever read — nine inherited from lecture-python.myst's tree when the repo was set up, plus the shadowed lectures/graph.txt (separate commit) — and adds lectures/graph.txt to .gitignore.

path	why it is an orphan
_static/lecture_specific/ols/maketable{1,2,4}.dta, mle/fp.dta	inherited; no ols/mle lecture here; the consuming lectures live in lecture-python.myst and read data-lectures
_static/lecture_specific/pandas_panel/{countries,employ,realwage}.csv	inherited; consuming lectures live in lecture-python-programming / lecture-python.myst and read data-lectures
_static/lecture_specific/match_transport/acs_data_summary.csv	inherited; the consuming lecture lives in lecture-python-advanced.myst and reads data-lectures
_static/lecture_specific/finite_markov/web_graph_data.txt	inherited; no finite_markov lecture here
graph.txt	short_path regenerates it with %%file before reading it

Published surface and settle — note the host. This repo publishes at quantecon.github.io/lecture-dp/; dp.quantecon.org is the Dynamic Programming book site and 404s every lecture path, so a check against it passes vacuously. On the real host all nine _static files serve at 200 today (graph.txt does not). There is no _build/html prune here (QuantEcon/workspace-lectures#41), so they clear on the settle policy — next Monday clean rebuild, then the next publish-* tag. The last publish was publish-2026jul07, so that may be a while; nothing reads them meanwhile, and this repo has no forks.

Rows for QuantEcon/workspace-lectures#40 (published URL, measured today with a 200 page control and a 404 never-existed control on the same host; expect 404 after the settle):

path (under https://quantecon.github.io/lecture-dp)	today
/_static/lecture_specific/ols/maketable1.dta	200, 14,466 B
/_static/lecture_specific/ols/maketable2.dta	200, 11,210 B
/_static/lecture_specific/ols/maketable4.dta	200, 12,024 B
/_static/lecture_specific/mle/fp.dta	200, 1,024,085 B
/_static/lecture_specific/pandas_panel/countries.csv	200, 49,605 B
/_static/lecture_specific/pandas_panel/employ.csv	200, 1,725,234 B
/_static/lecture_specific/pandas_panel/realwage.csv	200, 121,589 B
/_static/lecture_specific/match_transport/acs_data_summary.csv	200, 14,365 B
/_static/lecture_specific/finite_markov/web_graph_data.txt	200, 296 B

Deletion-time reader sweep (2026-09-01). Authenticated tarball-and-grep pass over 407 repositories: all 283 QuantEcon org repos (70 private, 26 archived; numfocus, quantecon-book-dp and test-cli are empty and unfetchable) plus 130 forks of the six holding repos (2 returned 404 and are recorded as not-swept rather than clean). Matched by basename, not URL, with each hit's three preceding lines folded in because URLs get split across source lines. Controls fired in the same pass: a never-existing basename returned 0 hits and 0 copies, and both known readers were found — the English python_advanced_features.md exercise link to test_table.csv, and devopseng99/project.lecture-wasm's runtime fetch of intro's graph.txt. Result: no repository reads any path this PR deletes. Every other co-occurrence of these basenames is a %%file embed, prose, a .gitignore line, or review text; the pre-MyST master/source/… reads in old course repos have been dead since the MyST migration and are unaffected.

Part of the Track X orphan sweep, QuantEcon/workspace-lectures#57 (one PR per holding repo, identical titles). Source list: https://quantecon.github.io/data-lectures/audit.json orphans, 2026-08-31 run.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Removes committed “orphan” dataset/static files that are not used by any lecture in this repository and prevents reintroducing the autogenerated graph.txt by ignoring it.

Changes:

• Delete unused committed data assets under lectures/_static/lecture_specific/**.
• Delete the previously committed lectures/graph.txt (regenerated by short_path.md).
• Add lectures/graph.txt to .gitignore to avoid recommitting the regenerated artifact.

Reviewed changes

Copilot reviewed 4 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lectures/_static/lecture_specific/ols/maketable1.dta	Remove unused inherited dataset file.
lectures/_static/lecture_specific/ols/maketable2.dta	Remove unused inherited dataset file.
lectures/_static/lecture_specific/ols/maketable4.dta	Remove unused inherited dataset file.
lectures/_static/lecture_specific/mle/fp.dta	Remove unused inherited dataset file.
lectures/_static/lecture_specific/pandas_panel/countries.csv	Remove unused inherited dataset file.
lectures/_static/lecture_specific/pandas_panel/employ.csv	Remove unused inherited dataset file.
lectures/_static/lecture_specific/pandas_panel/realwage.csv	Remove unused inherited dataset file.
lectures/_static/lecture_specific/match_transport/acs_data_summary.csv	Remove unused inherited dataset file.
lectures/_static/lecture_specific/finite_markov/web_graph_data.txt	Remove unused inherited data file.
lectures/graph.txt	Remove committed autogenerated artifact.
.gitignore	Ignore lectures/graph.txt to prevent recommits.

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[mmcky]

Validation (2026-09-01): this repo has no preview step, so the channels are the build and the sources. Build Project [using jupyter-book] succeeded on the branch; its log (1,175 lines) has 0 warnings or errors mentioning any of the ten deleted basenames. No lecture in this repo references any of them: short_path.md writes graph.txt with %%file (line 272) and reads that; there is no ols, mle, pandas_panel, finite_markov or match_transport lecture here, and the consuming lectures in the other repos all read data-lectures. Live-site check for QuantEcon/workspace-lectures#40 after the settle: probe quantecon.github.io/lecture-dp/_static/lecture_specific/…, not dp.quantecon.org (the book site, which 404s every lecture path).