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create or replace function generate_unique_changeme()
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returns text language sql
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as $$
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select 'http://changeme_' || string_agg (substr('abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789', ceil (random() * 62)::integer, 1), '')
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from generate_series(1, 20)
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$$;
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