Maxfield Luke
af6077b9c3
Fresh repository history for elektrine/tarakan hosted at https://git.elektrine.com/elektrine/tarakan.
30 lines
1 KiB
Elixir
30 lines
1 KiB
Elixir
defmodule Tarakan.Repo.Migrations.CreateCreditLedger do
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use Ecto.Migration
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def change do
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create table(:credit_entries) do
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add :account_id, references(:accounts), null: false
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add :amount, :integer, null: false
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add :kind, :string, null: false
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add :subject_type, :string
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add :subject_id, :bigint
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add :balance_after, :integer, null: false
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timestamps(type: :utc_datetime_usec, updated_at: false)
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end
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create index(:credit_entries, [:account_id, :id])
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# Mint idempotency: one entry per (kind, subject, account). Postgres treats
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# NULLs as distinct, and non-mint entries have no subject, so the index is
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# partial on rows that carry a subject.
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create unique_index(:credit_entries, [:kind, :subject_type, :subject_id, :account_id],
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name: :credit_entries_mint_unique_index,
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where: "subject_type IS NOT NULL"
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)
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alter table(:accounts) do
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add :credit_balance, :integer, null: false, default: 0
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end
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end
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end
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