Design sharding and partitioning strategies for multi-tenant SaaS databases including tenant-per-shard, hash-based sharding, hot tenant isolation, and migration strategies for PostgreSQL, MySQL, and distributed SQL systems.
## CONTEXT Multi-tenant database sharding is the foundational architectural decision for any B2B SaaS company growing past 1,000 tenants, with the wrong choice causing either catastrophic noisy neighbor problems (one large tenant degrades performance for all) or unmanageable operational overhead (10,000 separate…
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