feat(erc721): refac to use dbpool

[MartianGreed]

No description provided.

[github-actions]

📊 Synthetic Benchmark Results

Comparing against baseline: 20260410T092417Z

Performance Summary

Token Type	Duration (ms)	Blocks	Transactions	Events	Envelopes	Blocks/sec	Events/sec
erc1155	11402	100	50000	50000	70000	8.77	4385.10
erc721	12052	100	50000	50000	50000	8.30	4148.48
erc20	2893	100	50000	50000	50000	34.56	17279.98

Comparison with Baseline

Token Type	Metric	Baseline	Current	Change
erc1155	Throughput (events/sec)	4385.10	4385.10	➡️ 0.0%
erc1155	Duration (ms)	11402	11402	➡️ 0.0%
erc721	Throughput (events/sec)	4148.48	4148.48	➡️ 0.0%
erc721	Duration (ms)	12052	12052	➡️ 0.0%
erc20	Throughput (events/sec)	17279.98	17279.98	➡️ 0.0%
erc20	Duration (ms)	2893	2893	➡️ 0.0%

Legend:

• ✅ Improvement (faster)
• ⚠️ Regression (slower)
• 📈 Throughput increase
• 📉 Throughput decrease
• ➡️ No significant change (<5%)

Stage Latency Breakdown

Token Type	Extract (ms)	Decode (ms)	Sink (ms)	Commit (ms)
erc1155	40.146021000000005	103.78001499999999	11168.227577999998	0.033982
erc721	12.101333	397.8971529999997	11567.168985999993	0.032446
erc20	15.785885000000004	61.274408	2731.6933279999994	0.025477999999999997

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