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Add kafka-streams module: fraud detection topology tested with TopologyTestDriver

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Similarity scoring, a 5-minute windowed count that alerts once, and a KTable
blocklist join, with the Spring wiring on Spring Boot 4.1.1 and Kafka Streams 4.2.1.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01RjfyTgmERTWLqzafu34Cth
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asmhatre
2026-10-14 06:44:56 +00:00
co-authored by Claude Sonnet 5.5
parent 5db56e70a0
commit 59fcdbe079
19 changed files with 520 additions and 0 deletions
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kafka-streams/output/03-velocity-window.txt
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alerts <- c9 VELOCITY:4 in 5m
alerts emitted for 6 transactions in 2 minutes: 1
alerts after one more transaction 10 minutes later: 0
state store window 2026-10-14T10:00:00Z count=6
state store window 2026-10-14T10:10:00Z count=1