5f3430bd98
- Rename 021_create_uuid_v7_function.sql to 009_create_uuid_v7_function.sql - Add CREATE EXTENSION IF NOT EXISTS pgcrypto for gen_random_bytes() - Remove obsolete 022_migrate_to_uuid_v7.sql (already handled by table def) This fixes the error where migration 017 tried to use uuid_generate_v7() before it was created.
60 lines
1.9 KiB
PL/PgSQL
60 lines
1.9 KiB
PL/PgSQL
-- Migration: Create UUID v7 generation function
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-- Description: PostgreSQL function to generate UUID v7 (time-ordered UUIDs)
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-- UUID v7 format: tttttttt-tttt-7xxx-yxxx-xxxxxxxxxxxx
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-- Where: t = timestamp, 7 = version, y = variant, x = random
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-- Enable pgcrypto extension for gen_random_bytes()
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CREATE EXTENSION IF NOT EXISTS pgcrypto;
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-- Create or replace the uuid_generate_v7 function
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CREATE OR REPLACE FUNCTION uuid_generate_v7()
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RETURNS uuid AS $$
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DECLARE
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unix_ts_ms bigint;
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uuid_bytes bytea;
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BEGIN
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-- Get current Unix timestamp in milliseconds
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unix_ts_ms := (EXTRACT(EPOCH FROM clock_timestamp()) * 1000)::bigint;
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-- Build the UUID bytes:
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-- First 6 bytes: timestamp (48 bits)
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-- Next 2 bytes: version (4 bits) + random (12 bits)
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-- Last 8 bytes: variant (2 bits) + random (62 bits)
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uuid_bytes := set_byte(
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set_byte(
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set_byte(
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set_byte(
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set_byte(
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set_byte(
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gen_random_bytes(16),
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0, (unix_ts_ms >> 40)::int
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),
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1, (unix_ts_ms >> 32)::int
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),
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2, (unix_ts_ms >> 24)::int
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),
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3, (unix_ts_ms >> 16)::int
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),
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4, (unix_ts_ms >> 8)::int
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),
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5, unix_ts_ms::int
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);
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-- Set version 7 (0111) in byte 6
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uuid_bytes := set_byte(uuid_bytes, 6, (get_byte(uuid_bytes, 6) & 15) | 112);
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-- Set variant RFC 4122 (10xx) in byte 8
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uuid_bytes := set_byte(uuid_bytes, 8, (get_byte(uuid_bytes, 8) & 63) | 128);
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RETURN encode(uuid_bytes, 'hex')::uuid;
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END;
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$$ LANGUAGE plpgsql VOLATILE;
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-- Comment
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COMMENT ON FUNCTION uuid_generate_v7() IS 'Generates a UUID v7 (time-ordered) - RFC 9562 compliant';
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-- Test the function
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DO $$
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BEGIN
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RAISE NOTICE 'UUID v7 test: %', uuid_generate_v7();
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END $$;
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