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Document dd.sql idempotency: migration is re-running the whole script #35

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Merged
markmnl merged 1 commit into from
Aug 3, 2026
Merged

Document dd.sql idempotency: migration is re-running the whole script #35

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10 changes: 10 additions & 0 deletions dd.sql
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Expand Up @@ -5,6 +5,16 @@
--
-- fmsg-webapi assumes fmsgd is the fmsg host implementation and uses the same
-- PostgreSQL database.
--
-- This script is IDEMPOTENT: every statement is safe to re-run (CREATE ... IF
-- NOT EXISTS, ALTER TABLE ... ADD COLUMN IF NOT EXISTS, DROP CONSTRAINT IF
-- EXISTS, guarded DO blocks). Migrating an existing database is therefore
-- just re-running the whole script, e.g.:
--
-- psql -d fmsgd -v ON_ERROR_STOP=1 -f dd.sql
--
-- Keep it that way: add new objects and columns only with idempotent
-- statements.

CREATE TABLE IF NOT EXISTS fmsg_api_sub_account (
owner_addr varchar(255) NOT NULL,
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