fix: correct epoch calculation, mechanism_id mapping, and skip zero-w… #464

Job	Run time
Build	2m 30s
Clippy	1m 52s
Test	1m 30s
Coverage	1m 34s
Nightly Build & Test	0s
Docker Nightly Build	-1s
Integration	1m 19s
E2E	1m 23s
Docker	2m 51s
Docker Integration (5 Validators + WASM)	5m 16s
Release	0s
	18m 14s

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