Sql safety
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Database safety rules for the data-access layer.
SKILL.md
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SQL Safety
Parameterized queries
Always use parameterized queries for every database access. Never concatenate user-provided strings into SQL statements directly. This includes dynamic WHERE clauses, ORDER BY clauses, and table names.
Migration discipline
All schema migrations go through the migrations/ directory and run in the deploy pipeline; never modify the production schema by hand. Each migration is reversible — pair every up with a tested down.
Connection pooling
Use connection pools sized to peak concurrent load divided by average query latency. Never open and close a fresh connection per request in a hot path; the handshake cost dominates everything else under load.
Read replicas
Route read-only queries to read replicas. Writes always go to primary. Track replication lag and surface it on dashboards.
Input validation
Validate and sanitize all user-provided data at the system boundary before it enters business logic. Reject inputs that do not match the expected shape, range, or type.
Boundary discipline
Treat any data that crossed a network or process boundary as untrusted until proven otherwise. Apply the same scrutiny to data from other internal services as you would to data from the public internet. The threat model assumes lateral movement; act accordingly across every service-to-service hop in the system.