Infrastructure¶

Planned infrastructure improvements: compute (Graviton, Reserved Instances), database (Aurora Serverless v2), cache (Valkey cluster), and cross-region disaster recovery.

Graviton Migration (r6g / m6g)¶

Current	Target	Savings	Trigger
r6i.large ($0.152/hr)	r6g.large (~$0.122/hr)	~20%	10K+ users
m6i.xlarge ($0.24/hr)	m6g.xlarge (~$0.192/hr)	~20%	10K+ users

Why Not Now?

Graviton (ARM64) requires validating all Python dependencies compile on ARM. The Shioaji SDK currently distributes x86-only wheels. Gate.io SDK needs testing. Migration is low-risk but requires dedicated testing effort.

Steps: 1. Build ARM64 Docker images in CI/CD 2. Validate Shioaji SDK ARM compatibility (or use x86 emulation layer) 3. Run parallel ARM + x86 capacity providers 4. Gradually shift traffic to ARM instances 5. Decommission x86 instances

Reserved Instances / Savings Plans¶

Tier	Strategy	Estimated Savings
1K users	1-year RI for always-on baseline	~37% on 2-3 instances
5K users	1-year RI for peak capacity	~$680/month saved
50K users	3-year RI + Savings Plans	~57% on all EC2

Aurora Serverless v2¶

Replace instance-based RDS with Aurora Serverless v2 for automatic scaling:

graph LR
    subgraph current["Current (Instance-Based)"]
        RDS1["db.t3.large<br/>Fixed capacity<br/>Manual scaling"]
    end

    subgraph future["Future (Serverless v2)"]
        RDS2["Aurora Serverless v2<br/>0.5 - 128 ACU<br/>Auto-scaling"]
    end

    current -->|"Migration at 1K users"| future

Benefits: - Auto-scales ACU (Aurora Capacity Units) with load - Scales to zero during off-hours (cost savings) - No manual instance type changes - Seamless Multi-AZ failover

Trade-off: Higher per-ACU cost than Reserved Instances at sustained high load.

ElastiCache Valkey Cluster Mode¶

Scale	Current	Future
1-10K	Serverless (auto-scaling)	Continue serverless
50K+	Serverless	Provisioned cluster (3-6 shards)

At 50K+ users with 17,500 concurrent workers, provisioned cluster mode provides better price-performance than serverless at sustained high throughput.

Cross-Region Disaster Recovery¶

At 50K+ users, deploy cross-region backup:

Aurora Global Database (read replica in secondary region)
ElastiCache Global Datastore
S3 cross-region replication for backups
Route 53 failover routing

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