PR #563: Wire pitcher_arm_angles + bat-tracking-swing-path + refresh batter statcast data

[jaayslaughter-cpu]

PR #563 — Wire Two Unwired Statcast Files + Fresh Batter Data

Both pitcher_arm_angles.csv and bat-tracking-swing-path.csv have been sitting in data/statcast/ since upload but were never loaded by statcast_static_layer.py. This PR wires them in and refreshes batter statcast data.

Changes

statcast_static_layer.py (+62 lines, 911 → 973)

• New _pitcher_arm_angles dict — {pitcher_id: {ball_angle, pitch_hand, release_z, shoulder_z, n_pitches}}
• New loader for pitcher_arm_angles.csv — 306 pitchers; keyed by pitcher (MLBAM ID)
• New loader for bat-tracking-swing-path.csv — supplements _batter_tracking with swing_tilt, attack_angle, ideal_attack_rate, attack_direction for ~222 batters
• New get_pitcher_arm_angle(player_id) public function

data/statcast/statcast_batters_2026.csv

• Refreshed with latest upload (178 → 179 batters)

New Signal Availability

Signal	Source	Usage
ball_angle	pitcher_arm_angles.csv	Arm angle deception signal
swing_tilt	bat-tracking-swing-path.csv	K susceptibility
attack_angle	bat-tracking-swing-path.csv	Contact quality
ideal_attack_rate	bat-tracking-swing-path.csv	Contact consistency

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Summary by cubic

Wired pitcher arm angles and bat swing path data into the Statcast static layer to expose new pitcher/batter signals. Also refreshed batter Statcast data.

• New Features
  • Load pitcher_arm_angles.csv into _pitcher_arm_angles.
  • Add get_pitcher_arm_angle(player_id) to fetch arm slot metrics.
  • Load bat-tracking-swing-path.csv to augment _batter_tracking with swing_tilt, attack_angle, ideal_attack_rate, attack_direction.
  • Refresh statcast_batters_2026.csv to latest.

^{Written for commit 86dfe23. Summary will update on new commits.}

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📥 Commits

Reviewing files that changed from the base of the PR and between ad4c14d and 86dfe23.

📒 Files selected for processing (1)

• statcast_static_layer.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pr-563-statcast-new-signals

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[deepsource-io]

DeepSource Code Review

We reviewed changes in ad4c14d...86dfe23 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Docker		May 15, 2026 2:23a.m.	Review ↗
JavaScript		May 15, 2026 2:23a.m.	Review ↗
Python		May 15, 2026 2:23a.m.	Review ↗
SQL		May 15, 2026 2:23a.m.	Review ↗
Secrets		May 15, 2026 2:23a.m.	Review ↗

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[codacy-production]

Up to standards ✅

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[gemini-code-assist]

Code Review

This pull request introduces support for pitcher arm angles and bat tracking swing path data. It updates the _load function to parse pitcher_arm_angles.csv and bat-tracking-swing-path.csv, populating a new _pitcher_arm_angles dictionary and supplementing existing batter tracking data with metrics like swing tilt and attack angle. A new helper function, get_pitcher_arm_angle, was also added to retrieve pitcher-specific arm angle information. I have no feedback to provide as there were no review comments.