storage: add initial postgres event persistence and schema migration

priv/repo/migrations/20260313192433_create_relay_storage.exs

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+defmodule Parrhesia.Repo.Migrations.CreateRelayStorage do
+  use Ecto.Migration
+
+  def up do
+    create table(:event_ids, primary_key: false) do
+      add(:id, :binary, primary_key: true)
+      add(:created_at, :bigint, null: false)
+      timestamps(updated_at: false, type: :utc_datetime_usec)
+    end
+
+    create table(:events, primary_key: false, options: "PARTITION BY RANGE (created_at)") do
+      add(:created_at, :bigint, primary_key: true)
+      add(:id, :binary, primary_key: true)
+      add(:pubkey, :binary, null: false)
+      add(:kind, :integer, null: false)
+      add(:content, :text, null: false)
+      add(:sig, :binary, null: false)
+      add(:d_tag, :text)
+      add(:deleted_at, :bigint)
+      add(:expires_at, :bigint)
+      timestamps(type: :utc_datetime_usec)
+    end
+
+    execute("CREATE TABLE events_default PARTITION OF events DEFAULT")
+
+    execute("CREATE INDEX events_kind_created_at_idx ON events (kind, created_at DESC)")
+    execute("CREATE INDEX events_pubkey_created_at_idx ON events (pubkey, created_at DESC)")
+    execute("CREATE INDEX events_created_at_idx ON events (created_at DESC)")
+    create(index(:events, [:id]))
+    create(index(:events, [:expires_at], where: "expires_at IS NOT NULL"))
+    create(index(:events, [:deleted_at], where: "deleted_at IS NOT NULL"))
+
+    create table(:event_tags, primary_key: false) do
+      add(:event_created_at, :bigint, null: false)
+      add(:event_id, :binary, null: false)
+      add(:name, :string, null: false)
+      add(:value, :string, null: false)
+      add(:idx, :integer, null: false)
+      timestamps(updated_at: false, type: :utc_datetime_usec)
+    end
+
+    execute("""
+    ALTER TABLE event_tags
+    ADD CONSTRAINT event_tags_event_fk
+    FOREIGN KEY (event_created_at, event_id)
+    REFERENCES events (created_at, id)
+    ON DELETE CASCADE
+    """)
+
+    create(unique_index(:event_tags, [:event_created_at, :event_id, :idx]))
+
+    execute(
+      "CREATE INDEX event_tags_name_value_created_at_idx ON event_tags (name, value, event_created_at DESC)"
+    )
+
+    create(index(:event_tags, [:event_id]))
+
+    create table(:replaceable_event_state, primary_key: false) do
+      add(:pubkey, :binary, primary_key: true)
+      add(:kind, :integer, primary_key: true)
+      add(:event_created_at, :bigint, null: false)
+      add(:event_id, :binary, null: false)
+      timestamps(type: :utc_datetime_usec)
+    end
+
+    create table(:addressable_event_state, primary_key: false) do
+      add(:pubkey, :binary, primary_key: true)
+      add(:kind, :integer, primary_key: true)
+      add(:d_tag, :text, primary_key: true)
+      add(:event_created_at, :bigint, null: false)
+      add(:event_id, :binary, null: false)
+      timestamps(type: :utc_datetime_usec)
+    end
+
+    create table(:banned_pubkeys, primary_key: false) do
+      add(:pubkey, :binary, primary_key: true)
+      timestamps(updated_at: false, type: :utc_datetime_usec)
+    end
+
+    create table(:allowed_pubkeys, primary_key: false) do
+      add(:pubkey, :binary, primary_key: true)
+      timestamps(updated_at: false, type: :utc_datetime_usec)
+    end
+
+    create table(:banned_events, primary_key: false) do
+      add(:event_id, :binary, primary_key: true)
+      timestamps(updated_at: false, type: :utc_datetime_usec)
+    end
+
+    create table(:blocked_ips, primary_key: false) do
+      add(:ip, :inet, primary_key: true)
+      timestamps(updated_at: false, type: :utc_datetime_usec)
+    end
+
+    create table(:relay_groups, primary_key: false) do
+      add(:group_id, :text, primary_key: true)
+      add(:metadata, :map, null: false, default: %{})
+      timestamps(type: :utc_datetime_usec)
+    end
+
+    create table(:group_memberships, primary_key: false) do
+      add(
+        :group_id,
+        references(:relay_groups, column: :group_id, type: :text, on_delete: :delete_all),
+        primary_key: true
+      )
+
+      add(:pubkey, :binary, primary_key: true)
+      add(:role, :string, null: false)
+      add(:metadata, :map, null: false, default: %{})
+      timestamps(type: :utc_datetime_usec)
+    end
+
+    create(index(:group_memberships, [:pubkey]))
+
+    create table(:group_roles, primary_key: false) do
+      add(
+        :group_id,
+        references(:relay_groups, column: :group_id, type: :text, on_delete: :delete_all),
+        primary_key: true
+      )
+
+      add(:pubkey, :binary, primary_key: true)
+      add(:role, :string, primary_key: true)
+      add(:metadata, :map, null: false, default: %{})
+      timestamps(type: :utc_datetime_usec)
+    end
+
+    create table(:management_audit_logs) do
+      add(:actor_pubkey, :binary)
+      add(:method, :string, null: false)
+      add(:params, :map, null: false, default: %{})
+      add(:result, :map)
+      timestamps(updated_at: false, type: :utc_datetime_usec)
+    end
+
+    create(index(:management_audit_logs, [:actor_pubkey, :inserted_at]))
+    create(index(:management_audit_logs, [:method, :inserted_at]))
+  end
+
+  def down do
+    drop(table(:management_audit_logs))
+    drop(table(:group_roles))
+    drop(table(:group_memberships))
+    drop(table(:relay_groups))
+    drop(table(:blocked_ips))
+    drop(table(:banned_events))
+    drop(table(:allowed_pubkeys))
+    drop(table(:banned_pubkeys))
+    drop(table(:addressable_event_state))
+    drop(table(:replaceable_event_state))
+    drop(table(:event_tags))
+
+    execute("DROP TABLE events_default")
+    drop(table(:events))
+
+    drop(table(:event_ids))
+  end
+end

priv/repo/seeds.exs

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+# Seed data for Parrhesia.
+#
+# Intentionally empty for now.