Initial commit on Forgejo

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

priv/repo/migrations/20260726120000_index_unindexed_foreign_keys.exs

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+defmodule Tarakan.Repo.Migrations.IndexUnindexedForeignKeys do
+  use Ecto.Migration
+
+  # Postgres does not index a foreign key for you. Without one, deleting a
+  # parent row sequentially scans the whole child table to enforce the
+  # constraint - so removing a single account or repository degrades with the
+  # size of every table that references it, and the cascades declared on these
+  # columns make that certain rather than hypothetical.
+  #
+  # Created plainly because these tables are still small. Adding an index to a
+  # large, live table wants `concurrently: true` with
+  # `@disable_ddl_transaction true`, which is a different migration.
+  @columns [
+    {:bounties, :winner_account_id},
+    {:bounty_claims, :review_task_id},
+    {:canonical_finding_checks, :scan_finding_id},
+    {:client_authorizations, :account_id},
+    {:code_pattern_rules, :author_account_id},
+    {:finding_comments, :removed_by_id},
+    {:finding_comments, :repository_id},
+    {:finding_regressions, :detected_by_scan_id},
+    {:fix_propagations, :canonical_finding_id},
+    {:fix_propagations, :review_task_id},
+    {:fix_templates, :created_by_id},
+    {:fix_templates, :source_repository_id},
+    {:moderation_appeals, :appellant_id},
+    {:moderation_appeals, :decided_by_id},
+    {:moderation_cases, :assigned_to_id},
+    {:moderation_cases, :resolved_by_id},
+    {:registry_shouts, :removed_by_id},
+    {:repository_memberships, :verified_by_account_id}
+  ]
+
+  def change do
+    for {table, column} <- @columns do
+      create_if_not_exists index(table, [column])
+    end
+  end
+end