feat: rebuild auth identity foundation flow

backend/ent/schema/auth_identity_channel.go

@@ -0,0 +1,72 @@
+package schema
+
+import (
+	"github.com/Wei-Shaw/sub2api/ent/schema/mixins"
+
+	"entgo.io/ent"
+	"entgo.io/ent/dialect"
+	"entgo.io/ent/dialect/entsql"
+	"entgo.io/ent/schema"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+	"entgo.io/ent/schema/index"
+)
+
+// AuthIdentityChannel stores channel-scoped identifiers for a canonical identity.
+type AuthIdentityChannel struct {
+	ent.Schema
+}
+
+func (AuthIdentityChannel) Annotations() []schema.Annotation {
+	return []schema.Annotation{
+		entsql.Annotation{Table: "auth_identity_channels"},
+	}
+}
+
+func (AuthIdentityChannel) Mixin() []ent.Mixin {
+	return []ent.Mixin{
+		mixins.TimeMixin{},
+	}
+}
+
+func (AuthIdentityChannel) Fields() []ent.Field {
+	return []ent.Field{
+		field.Int64("identity_id"),
+		field.String("provider_type").
+			MaxLen(20).
+			NotEmpty().
+			Validate(validateAuthProviderType),
+		field.String("provider_key").
+			NotEmpty().
+			SchemaType(map[string]string{dialect.Postgres: "text"}),
+		field.String("channel").
+			MaxLen(20).
+			NotEmpty(),
+		field.String("channel_app_id").
+			NotEmpty().
+			SchemaType(map[string]string{dialect.Postgres: "text"}),
+		field.String("channel_subject").
+			NotEmpty().
+			SchemaType(map[string]string{dialect.Postgres: "text"}),
+		field.JSON("metadata", map[string]any{}).
+			Default(func() map[string]any { return map[string]any{} }).
+			SchemaType(map[string]string{dialect.Postgres: "jsonb"}),
+	}
+}
+
+func (AuthIdentityChannel) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.From("identity", AuthIdentity.Type).
+			Ref("channels").
+			Field("identity_id").
+			Required().
+			Unique(),
+	}
+}
+
+func (AuthIdentityChannel) Indexes() []ent.Index {
+	return []ent.Index{
+		index.Fields("provider_type", "provider_key", "channel", "channel_app_id", "channel_subject").Unique(),
+		index.Fields("identity_id"),
+	}
+}