https://aislackin.com/tags/postgres/Recent content in Postgres on AiSlackinHugoen-usTue, 16 Jun 2026 00:00:00 +0000https://aislackin.com/posts/2026-06-16-csv2pg/Tue, 16 Jun 2026 00:00:00 +0000https://aislackin.com/posts/2026-06-16-csv2pg/<p>Most &ldquo;import this CSV&rdquo; advice ends with <code>psql</code> invocations, <code>\copy</code> meta-commands, and a schema you hand-write after eyeballing the data in a spreadsheet. I got tired of that ritual, so <code>csv2pg</code> does the whole path in-process through psycopg3: analyze the file, infer the schema, create the table, stream the rows, verify the count, commit. No <code>psql</code> binary involved anywhere.</p> <p>The interesting part is the type inference. It samples up to 100 random rows per column to guess a candidate PostgreSQL type, then validates that guess against <em>every</em> row in the file. If validation fails, the column widens to the next compatible type — up to five attempts — before falling back to <code>text</code>. You get a tabulated summary plus a generated <code>.sql</code> file before anything touches the database.</p>