feat: add tables for PGCoordinator v2 (#10442)

Adds tables for a simplified PG Coordinator that only considers Peers and Tunnels, rather than agent/client distinctions we have today.

coderd/database/models.go

@@ -1289,6 +1289,64 @@ func AllStartupScriptBehaviorValues() []StartupScriptBehavior {
 	}
 }
 
+type TailnetStatus string
+
+const (
+	TailnetStatusOk   TailnetStatus = "ok"
+	TailnetStatusLost TailnetStatus = "lost"
+)
+
+func (e *TailnetStatus) Scan(src interface{}) error {
+	switch s := src.(type) {
+	case []byte:
+		*e = TailnetStatus(s)
+	case string:
+		*e = TailnetStatus(s)
+	default:
+		return fmt.Errorf("unsupported scan type for TailnetStatus: %T", src)
+	}
+	return nil
+}
+
+type NullTailnetStatus struct {
+	TailnetStatus TailnetStatus `json:"tailnet_status"`
+	Valid         bool          `json:"valid"` // Valid is true if TailnetStatus is not NULL
+}
+
+// Scan implements the Scanner interface.
+func (ns *NullTailnetStatus) Scan(value interface{}) error {
+	if value == nil {
+		ns.TailnetStatus, ns.Valid = "", false
+		return nil
+	}
+	ns.Valid = true
+	return ns.TailnetStatus.Scan(value)
+}
+
+// Value implements the driver Valuer interface.
+func (ns NullTailnetStatus) Value() (driver.Value, error) {
+	if !ns.Valid {
+		return nil, nil
+	}
+	return string(ns.TailnetStatus), nil
+}
+
+func (e TailnetStatus) Valid() bool {
+	switch e {
+	case TailnetStatusOk,
+		TailnetStatusLost:
+		return true
+	}
+	return false
+}
+
+func AllTailnetStatusValues() []TailnetStatus {
+	return []TailnetStatus{
+		TailnetStatusOk,
+		TailnetStatusLost,
+	}
+}
+
 // Defines the user status: active, dormant, or suspended.
 type UserStatus string
 
@@ -1865,6 +1923,21 @@ type TailnetCoordinator struct {
 	HeartbeatAt time.Time `db:"heartbeat_at" json:"heartbeat_at"`
 }
 
+type TailnetPeer struct {
+	ID            uuid.UUID     `db:"id" json:"id"`
+	CoordinatorID uuid.UUID     `db:"coordinator_id" json:"coordinator_id"`
+	UpdatedAt     time.Time     `db:"updated_at" json:"updated_at"`
+	Node          []byte        `db:"node" json:"node"`
+	Status        TailnetStatus `db:"status" json:"status"`
+}
+
+type TailnetTunnel struct {
+	CoordinatorID uuid.UUID `db:"coordinator_id" json:"coordinator_id"`
+	SrcID         uuid.UUID `db:"src_id" json:"src_id"`
+	DstID         uuid.UUID `db:"dst_id" json:"dst_id"`
+	UpdatedAt     time.Time `db:"updated_at" json:"updated_at"`
+}
+
 // Joins in the username + avatar url of the created by user.
 type Template struct {
 	ID                            uuid.UUID       `db:"id" json:"id"`