diff --git a/cmd/lotus-provider/proving.go b/cmd/lotus-provider/proving.go
index 129ca342f..584988469 100644
--- a/cmd/lotus-provider/proving.go
+++ b/cmd/lotus-provider/proving.go
@@ -13,6 +13,7 @@ import (
 	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-state-types/dline"
 
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
 	"github.com/filecoin-project/lotus/provider"
 )
 
@@ -30,6 +31,69 @@ var provingCompute = &cli.Command{
 	Usage: "Compute a proof-of-spacetime for a sector (requires the sector to be pre-sealed)",
 	Subcommands: []*cli.Command{
 		provingComputeWindowPoStCmd,
+		scheduleWindowPostCmd,
+	},
+}
+
+var scheduleWindowPostCmd = &cli.Command{
+	Name:  "test-window-post",
+	Usage: "FOR TESTING: a way to test the windowpost scheduler. Use with 1 lotus-provider running only",
+	Flags: []cli.Flag{
+		&cli.BoolFlag{
+			Name: "i_have_set_LOTUS_PROVDER_NO_SEND_to_true",
+		},
+		&cli.Uint64Flag{
+			Name:  "deadline",
+			Usage: "deadline to compute WindowPoSt for ",
+			Value: 0,
+		},
+		&cli.StringSliceFlag{
+			Name:  "layers",
+			Usage: "list of layers to be interpreted (atop defaults). Default: base",
+			Value: cli.NewStringSlice("base"),
+		},
+	},
+	Action: func(cctx *cli.Context) error {
+		ctx := context.Background()
+
+		if !cctx.Bool("i_have_set_LOTUS_PROVDER_NO_SEND_to_true") {
+			log.Info("This command is for testing only. It will not send any messages to the chain. If you want to run it, set LOTUS_PROVDER_NO_SEND=true on the lotus-provider environment.")
+			return nil
+		}
+		deps, err := getDeps(ctx, cctx)
+		if err != nil {
+			return err
+		}
+
+		ts, err := deps.full.ChainHead(ctx)
+		if err != nil {
+			return xerrors.Errorf("cannot get chainhead %w", err)
+		}
+
+		ht := ts.Height()
+		maddr, err := address.IDFromAddress(address.Address(deps.maddrs[0]))
+		if err != nil {
+			return xerrors.Errorf("cannot get miner id %w", err)
+		}
+		_ = ht
+		deps.db.BeginTransaction(ctx, func(tx *harmonydb.Tx) (commit bool, err error) {
+			_, err = tx.Exec(`INSERT INTO harmony_task (name) VALUES ('WdPost')`)
+			if err != nil {
+				return false, xerrors.Errorf("inserting harmony_task: %w", err)
+			}
+			var id int64
+			if err = tx.QueryRow(`SELECT id FROM harmony_task ORDER BY update_time DESC LIMIT 1`).Scan(&id); err != nil {
+				return false, xerrors.Errorf("getting inserted id: %w", err)
+			}
+			_, err = tx.Exec(`INSERT INTO wdpost_partition_tasks 
+			(task_id, sp_id, proving_period_start, deadline_index, partition_index) VALUES ($1, $2, $3, $4, $5)`,
+				id, maddr, ht, 1, cctx.Uint64("deadline"), 0)
+			if err != nil {
+				return false, xerrors.Errorf("inserting wdpost_partition_tasks: %w", err)
+			}
+			return true, nil
+		})
+		return nil
 	},
 }
 
diff --git a/provider/lpmessage/sender.go b/provider/lpmessage/sender.go
index 1dff1d6f7..655b1238b 100644
--- a/provider/lpmessage/sender.go
+++ b/provider/lpmessage/sender.go
@@ -2,6 +2,7 @@ package lpmessage
 
 import (
 	"context"
+	"os"
 
 	"github.com/google/uuid"
 	"github.com/ipfs/go-cid"
@@ -39,7 +40,8 @@ type Sender struct {
 	api    SenderAPI
 	signer SignerAPI
 
-	db *harmonydb.DB
+	db     *harmonydb.DB
+	noSend bool // For early testing with only 1 lotus-provider
 }
 
 // NewSender creates a new Sender.
@@ -47,8 +49,8 @@ func NewSender(api SenderAPI, signer SignerAPI, db *harmonydb.DB) *Sender {
 	return &Sender{
 		api:    api,
 		signer: signer,
-
-		db: db,
+		db:     db,
+		noSend: os.Getenv("LOTUS_PROVDER_NO_SEND") != "",
 	}
 }
 
@@ -137,6 +139,18 @@ func (s *Sender) Send(ctx context.Context, msg *types.Message, mss *api.MessageS
 			return false, xerrors.Errorf("marshaling message: %w", err)
 		}
 
+		if s.noSend {
+			log.Errorw("SKIPPED SENDING MESSAGE PER ENVIRONMENT VARIABLE - NOT PRODUCTION SAFE",
+				"from_key", fromA.String(),
+				"nonce", msg.Nonce,
+				"to_addr", msg.To.String(),
+				"signed_data", data,
+				"signed_json", string(jsonBytes),
+				"signed_cid", sigMsg.Cid(),
+				"send_reason", reason,
+			)
+			return true, nil // nothing committed
+		}
 		// write to db
 		c, err := tx.Exec(`insert into message_sends (from_key, nonce, to_addr, signed_data, signed_json, signed_cid, send_reason) values ($1, $2, $3, $4, $5, $6, $7)`,
 			fromA.String(), msg.Nonce, msg.To.String(), data, string(jsonBytes), sigMsg.Cid().String(), reason)
@@ -153,6 +167,9 @@ func (s *Sender) Send(ctx context.Context, msg *types.Message, mss *api.MessageS
 	if err != nil || !c {
 		return cid.Undef, xerrors.Errorf("transaction failed or didn't commit: %w", err)
 	}
+	if s.noSend {
+		return sigMsg.Cid(), nil
+	}
 
 	// push to mpool
 	_, err = s.api.MpoolPush(ctx, sigMsg)