anofox-forecast-data-prep SKILL.md skillA
anofox-forecast-data-prep from datazoode/anofox-forecast is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add datazoode/anofox-forecast/anofox-forecast-data-prep@v2026.09.26Pins v2026.09.26 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- datazoode/anofox-forecast
- Path
plugins/anofox-forecast/skills/anofox-forecast-data-prep/SKILL.md- Versions recorded
- 10
- Latest version
- v2026.09.26, committed Oct 28, 2026
- First version recorded
- Sep 18, 2026
- Size
- 10,535 bytes
- Repository stars
- 45
- License
- a license file GitHub does not identify
Data preparation for the anofox_forecast DuckDB extension — filling gaps, imputing nulls, dropping bad series, differencing, detrending, hierarchical key operations. Use when preparing raw time series for downstream forecasting or backtesting with `ts_forecast_by` / `ts_cv_folds_by`.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Anofox Forecast — Data Preparation Cheat Sheet
**Extension:** `anofox_forecast` v2026.09.26 (Rust crate `anofox-forecast` v0.16.2) | **DuckDB:** v2.0.0 / v1.5.6 | **Dual naming:** `ts_*` and `anofox_fcst_ts_*` (identical)
Prep raw time series so downstream forecasting / CV has clean input: no gaps, no unwanted NULLs, no degenerate series, correct hierarchy.
## Critical gotcha — materialise between `_by` steps
`_by` table functions **do not chain in CTEs** — under parallel execution they silently return 0 rows. Always `CREATE TABLE` between pipeline steps.
```sql
-- BROKEN (silent 0 rows under parallelism) -- `raw` is (product_id, ds, y):
WITH step1 AS (SELECT * FROM ts_fill_gaps_by('raw', product_id, ds, y, '1d'))
SELECT * FROM ts_fill_nulls_const_by('step1', product_id, ds, y, 0.0);
```
```sql
-- CORRECT:
CREATE OR REPLACE TABLE step1 AS SELECT * FROM ts_fill_gaps_by('raw', product_id, ds, y, '1d');
CREATE OR REPLACE TABLE step2 AS SELECT * FROM ts_fill_nulls_const_by('step1', product_id, ds, y, 0.0);
```
## Gap filling
### `ts_fill_gaps_by`
Insert missing date rows (NULL value) so every series has a complete regular grid.
```sql
…Read the whole file at its exact version.
How to install
mdr add datazoode/anofox-forecast/anofox-forecast-data-prep@sha256:53894a260b261622The line at the top of this page pins the label v2026.09.26, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_2kjakfhqoesymzhd)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 10 versions of this file, between Sep 18, 2026 and Oct 28, 2026, about one every 4 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v2026.09.26 latest | 2026-10-28 | eeb26da | 10,535 B | A | view · diff |
| v2026.09.26 | 2026-10-23 | d35f1d4 | 10,548 B | A | view · diff |
| v2026.09.26 | 2026-10-22 | fb11ec5 | 10,365 B | A | view · diff |
| v2026.09.26 | 2026-10-22 | 7f33142 | 10,306 B | A | view · diff |
| v2026.09.26 | 2026-10-16 | 3a62628 | 10,298 B | A | view · diff |
| v2026.09.26 | 2026-10-15 | 2cbb500 | 10,294 B | A | view · diff |
| v2026.09.26 | 2026-10-15 | 12b3642 | 10,294 B | A | view · diff |
| v2026.09.26 | 2026-10-14 | 042ba8a | 9,582 B | A | view · diff |
| v2026.09.26 | 2026-10-12 | b3755ae | 8,785 B | A | view · diff |
| v0.15.3 | 2026-09-18 | e2d0889 | 6,558 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10535 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
datazoode/anofox-forecast · 45 stars · license a license file GitHub does not identify · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_2kjakfhqoesymzhd GET https://markdownregistry.com/api/v1/resolve?ref=datazoode/anofox-forecast/anofox-forecast-data-prep GET https://markdownregistry.com/api/v1/blob/53894a260b261622a6f97f9476147293753cb03b76121091ffe8040526ca72e9
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Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.