Every company has a production database with the answers. Only two or three people can write the SQL. When the CEO asks a question on Tuesday, it gets added to the engineering backlog and answered the following Monday, if at all.
Connecting PostgreSQL to Claude through CorpusIQ breaks that bottleneck safely. Claude converts questions to read-only SQL, runs them, and returns the answer. No one writes to production. Nobody bypasses the DBA.
The problem with the current workflow
Data access is a classic dependency problem. Product, marketing, finance, and ops all have questions. Engineering has the SQL skills. The queue grows faster than it shrinks. Non-technical stakeholders either get stale data or build workarounds that drift from source of truth.
The usual fix is a BI layer on top. That works for the 20 questions you expect. It fails for the 200 questions you do not.
How CorpusIQ solves it
CorpusIQ connects PostgreSQL to Claude through MCP. Claude can list tables, describe schemas, and execute read-only SELECT queries.
SELECT-only enforcement. INSERT, UPDATE, DELETE, DROP, ALTER, and other mutating statements are blocked at the connector level. Claude cannot modify the database, regardless of prompt.
No retention. Query results pass through and are not stored.
Standard connection. SSL-encrypted connection using credentials you provide. For private databases, point at a read replica or a bastion.
What you can actually do
- "How many new users signed up this week, broken down by acquisition channel?"
- "Show me the top 20 accounts by MRR and the percentage that are on annual contracts."
- "Which customers have had more than 3 support tickets in the last 30 days?"
- "What is the median time from signup to first paid action for the last 90 days?"
- "Compare churn rate this quarter to last quarter."
- "Show me users who were active daily in the last week but have not upgraded."
- "What is the distribution of subscription plans across the customer base?"
- "Find orders with a refund amount greater than the order value."
Follow-ups work. Ask about churn, break it down by segment, ask which features correlate with retention.
Setup in 3 minutes
- Sign up at corpusiq.io. Solo $29.95/month includes database connectors.
- From the dashboard, configure the PostgreSQL connection. Host, port, database, read-only user credentials, SSL.
- Connect CorpusIQ to Claude.
Critical: always connect with a read-only user. CorpusIQ enforces SELECT-only at the connector, but defense in depth is defense in depth.
Where this earns its keep
Engineering teams tired of serving data requests benefit immediately. So do data-starved product and marketing teams who are used to waiting. The unlock is not that Claude writes perfect SQL: it is that non-technical operators can finally self-serve.
Pairs well with QuickBooks, Shopify, and HubSpot when you want to join your product database against business data.
What to watch out for
Three caveats.
Claude can write SQL that is technically correct but semantically wrong if your schema is confusing. Table and column names should be descriptive. If columns are called flag1 and flag2, Claude will struggle in the same way a human analyst would.
Permissions should be restrictive. Create a dedicated read-only user with access only to the tables Claude should touch. Do not grant SELECT on tables containing sensitive data (passwords, payment tokens, PHI) unless that is explicitly the intent.
Query cost matters at scale. A naive SELECT on a billion-row table can take minutes and strain your database. Claude will attempt to write efficient queries, but for large tables, consider creating materialized views or running against a read replica.
See also
FAQ
Does Claude run write queries?
No. CorpusIQ executes only SELECT queries. INSERT, UPDATE, DELETE, DROP are blocked at the connector level.
Is my database accessible over the internet?
Connection uses your existing network access. CorpusIQ supports standard PostgreSQL connection with SSL. For private databases, use a read replica or bastion.
Does CorpusIQ see the data?
Only in transit when answering a query. No data is stored.
What about MSSQL and other databases?
MSSQL and Azure Cosmos DB are also supported. MySQL is on the roadmap.