Execute a read-only SQL query against the target connection. ONLY SELECT / WITH / EXPLAIN permitted. Write dialect-appropriate SQL for the connection's engine — PostgreSQL syntax for postgres, T-SQL for mssql, MySQL for mysql. Response meta includes connection + dialect so you know which syntax worked. Default LIMIT 100 unless the user asks for all rows.

Discover the full database schema: tables, columns, types, primary keys, foreign keys, and indexes. Results cached 1 hour. Call with refresh=true after schema changes.

QUICK statistical snapshot for ONE table — row count, null rates, cardinality, numeric min/max/avg, date ranges. Optionally drill into a specific column. Use data_profile when the user wants a FULL quality report including PII detection.

Scan a table for unusual patterns: volume drops/spikes, data gaps, value concentration, high null rates, stale data. Severity-ranked alerts. Tables > 100k rows use a sampled path (~5%). Dialect-aware sampling.

Generate schema-aware query suggestions with ready-to-run SQL. Great for exploring unfamiliar databases or finding useful queries.

Ping a connection (SELECT 1) and return server version + latency. Fast way to confirm credentials and network path without running describe_schema.

List every database connection registered for your tenant: name, id, dbType (postgres / mysql / mssql), createdAt. Flags duplicate names. Returns nothing sensitive (no DSN, no credentials).

Check current API usage, daily limit, plan name, and upgrade options.

Issue a fresh ta_data_* API key for your current tenant. Useful for pasting into /add-database or configuring a separate integration. Rate-limited to 5 issuances per tenant per day.

Analyze a SQL query's execution plan and return plain-English performance recommendations. Runs EXPLAIN ANALYZE (Postgres) or EXPLAIN FORMAT=JSON (MySQL). [BUILD tier]

Suggest a rewritten, optimized version of a SQL query with explanations. Identifies sequential scans, missing indexes, sort spills, join inefficiencies, and suggests index DDL. [BUILD tier]

FULL data quality + compliance report for a table: per-column stats PLUS a 0-100 health score, type-gated PII detection (email / phone / SSN / etc.), and insight warnings. Use this when the user says 'profile' or 'quality report' or mentions PII/compliance. [BUILD tier]

Return recent queries executed through ThinAir with timing, row counts, and status. [BUILD tier]

Manage your personal library of reusable SELECT queries. action=save stores a query by name; action=run executes a saved query; action=list returns all your saved queries; action=delete removes one. [BUILD tier]

Generate dialect-correct ALTER TABLE migration SQL + rollback from a plain-English intent. Output uses the connection's exact dialect. Never executes. [BUILD tier]

Generate realistic, schema-aware INSERT statements for development and testing. Respects types, constraints, and FK relationships. Never executes. [BUILD tier]

List active sessions + blocking locks. Uses the dialect's own system view: pg_stat_activity on postgres, information_schema.processlist on mysql, sys.dm_exec_requests joined with sys.dm_tran_locks on mssql. [BUILD tier]

Sweep string columns across tables for common PII patterns (email, SSN, credit card, phone, JWT, bearer tokens). Heuristic-only — not a compliance guarantee. [BUILD tier]

Monitor a table's row count and latest record. Compares to previous snapshot to show changes. Built-in scheduler. [ARCHITECT tier]

Detect N+1 query patterns from recent query history. Fingerprints queries and flags repeated patterns. [ARCHITECT tier]

Manage per-connection SQL rules: block dangerous patterns, require WHERE on large tables, log PII access. [ARCHITECT tier]

Analyze the blast radius of a proposed schema change: FK dependencies, affected views, row count, risk score. [ARCHITECT tier]

Run a federated query across multiple connections (different dialects). Returns a unified result set with per-source provenance. [ARCHITECT tier]