Add batch-llm module: 100,000 synthetic tickets classified by a ChatClient in a Spring Batch 6 chunk step with Resilience4j rate limiting and retry, skip-and-record for malformed JSON, restart after kill -9 in a second JVM, and a per-chunk cost ledger. The model is a deterministic simulated ChatModel; prices are configurable placeholders. No provider called.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
2026-10-29 06:10:22 +00:00
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+# 4,000 tickets against a simulated quota of 800 calls per second
+
+Both runs: 64 virtual threads, Resilience4j retry max 4 attempts, 25 ms x2 backoff, the same fault plan.
+Time is indicative only (shared 2-vCPU sandbox, other processes running).
+
+scenario           ok bad JSON  exhausted     calls  quota 429s  retries  seconds
+no limiter       3066       13        921     7,596       4,396    3,543      3.5
+limiter 600/s    3986       14          0     4,146           0       85      6.9
+
+'exhausted' = tickets whose 4 attempts all met a 429/503: with a step around this call, the step fails.
+'calls' counts every attempt the provider received, rejected or not.