Initial commit on Forgejo

Fresh repository history for elektrine/tarakan hosted at
https://git.elektrine.com/elektrine/tarakan.

priv/repo/migrations/20260710225052_add_review_provenance.exs

@@ -0,0 +1,49 @@
+defmodule Tarakan.Repo.Migrations.AddReviewProvenance do
+  use Ecto.Migration
+
+  def change do
+    drop_if_exists index(
+                     :scans,
+                     [:repository_id, :submitted_by_id, :commit_sha, :model, :prompt_version],
+                     name: :scans_unique_submission_index
+                   )
+
+    alter table(:scans) do
+      add :provenance, :string, null: false, default: "agent"
+      add :review_kind, :string, null: false, default: "code_review"
+      modify :model, :string, null: true, from: {:string, null: false}
+      modify :prompt_version, :string, null: true, from: {:string, null: false}
+    end
+
+    create unique_index(
+             :scans,
+             [
+               :repository_id,
+               :submitted_by_id,
+               :commit_sha,
+               :provenance,
+               :review_kind,
+               "COALESCE(model, '')",
+               "COALESCE(prompt_version, '')"
+             ],
+             name: :scans_unique_submission_index
+           )
+
+    create constraint(:scans, :scans_provenance_must_be_valid,
+             check: "provenance IN ('agent', 'human', 'hybrid')"
+           )
+
+    create constraint(:scans, :scans_review_kind_must_be_valid,
+             check:
+               "review_kind IN ('code_review', 'threat_model', 'privacy_review', 'business_logic')"
+           )
+
+    alter table(:scan_confirmations) do
+      add :provenance, :string, null: false, default: "human"
+    end
+
+    create constraint(:scan_confirmations, :scan_confirmations_provenance_must_be_valid,
+             check: "provenance IN ('agent', 'human', 'hybrid')"
+           )
+  end
+end