Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

ent/schema/entity.go

@@ -0,0 +1,54 @@
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+	"github.com/cloudreve/Cloudreve/v4/inventory/types"
+	"github.com/gofrs/uuid"
+)
+
+// Entity holds the schema definition for the Entity.
+type Entity struct {
+	ent.Schema
+}
+
+// Fields of the Entity.
+func (Entity) Fields() []ent.Field {
+	return []ent.Field{
+		field.Int("type"),
+		field.Text("source"),
+		field.Int64("size"),
+		field.Int("reference_count").Default(1),
+		field.Int("storage_policy_entities"),
+		field.Int("created_by").Optional(),
+		field.UUID("upload_session_id", uuid.Must(uuid.NewV4())).
+			Optional().
+			Nillable(),
+		field.JSON("recycle_options", &types.EntityRecycleOption{}).
+			Optional(),
+	}
+}
+
+// Edges of the Entity.
+func (Entity) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.From("file", File.Type).
+			Ref("entities"),
+		edge.From("user", User.Type).
+			Field("created_by").
+			Unique().
+			Ref("entities"),
+		edge.From("storage_policy", StoragePolicy.Type).
+			Ref("entities").
+			Field("storage_policy_entities").
+			Unique().
+			Required(),
+	}
+}
+
+func (Entity) Mixin() []ent.Mixin {
+	return []ent.Mixin{
+		CommonMixin{},
+	}
+}