lemmy/migrations/2023-06-06-104440_index_pos.../up.sql

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-- Make a hard limit of 512 for the post.url column
-- Truncate existing long rows.
UPDATE
post
SET
url =
LEFT (url,
512)
WHERE
length(url) > 512;
-- Enforce the limit
ALTER TABLE post
ALTER COLUMN url TYPE varchar(512);
-- Add the index
CREATE INDEX idx_post_url ON post (url);