pg_citext_convert_column
Convert an existing TEXT column to CITEXT for case-insensitive comparisons. This is useful for retrofitting case-insensitivity to existing columns like email or username. Note: If views depend on this column, you must drop and recreate them manually before conversion.
This record as markdown: /tools/io-github-neverinfamous-postgres-mcp/pg-citext-convert-column.md
What pg_citext_convert_column does on PostgreSQL MCP Server
AI agents use pg_citext_convert_column to create or update resources in PostgreSQL MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your PostgreSQL MCP Server environment.
Why pg_citext_convert_column is rated Medium
This tool modifies database schema by converting a column's data type. While not strictly destructive (the data itself is preserved), it is a Write operation that alters table structure and can break dependent objects (views). The requirement to manually drop and recreate views elevates severity to high due to potential for cascading failures and loss of dependent schema objects if not handled carefully.
From the tool's definition Convert an existing TEXT column to CITEXT — this modifies column type, a structural change to the database schema. The description notes that views depending on this column must be manually dropped and recreated, indicating irreversible schema alterations.
Attacks that exploit this kind of access
The rule that runs pg_citext_convert_column safely
PolicyLayer is an MCP gateway: it sits between your AI agents and PostgreSQL MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For pg_citext_convert_column, this is the rule to start with:
pg_citext_convert_column stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect PostgreSQL MCP Server, apply this rule, and every pg_citext_convert_column call is checked against it from then on.
Questions about pg_citext_convert_column
Convert an existing TEXT column to CITEXT for case-insensitive comparisons. This is useful for retrofitting case-insensitivity to existing columns like email or username. Note: If views depend on this column, you must drop and recreate them manually before conversion. It is categorised as a Write tool in the PostgreSQL MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the PostgreSQL MCP Server MCP server in PolicyLayer and add a rule for pg_citext_convert_column: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches PostgreSQL MCP Server. Nothing to install.
pg_citext_convert_column is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the pg_citext_convert_column rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for pg_citext_convert_column. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
pg_citext_convert_column is provided by the PostgreSQL MCP Server MCP server (@neverinfamous/postgres-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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