diff --git a/docker/localnode/scripts/step4_config_override.sh b/docker/localnode/scripts/step4_config_override.sh
index 9f7fd8e024..b3d8f01f3c 100755
--- a/docker/localnode/scripts/step4_config_override.sh
+++ b/docker/localnode/scripts/step4_config_override.sh
@@ -109,6 +109,16 @@ if [ "$AUTOBAHN" = "true" ]; then
   # Generate autobahn config using seid
   seid tendermint gen-autobahn-config $NODE_DIRS --output "$AUTOBAHN_CONFIG"
 
+  # For localnode/throughput-test runs we use a much shorter data_prune_after
+  # than the production default to keep data.State memory bounded during
+  # sustained load (cosmos-sdk's pruning is "nothing" in this setup).
+  if command -v jq >/dev/null 2>&1; then
+    tmp=$(mktemp)
+    jq '.data_prune_after = "5m0s"' "$AUTOBAHN_CONFIG" > "$tmp" && mv "$tmp" "$AUTOBAHN_CONFIG"
+  else
+    sed -i 's|"data_prune_after": *"[^"]*"|"data_prune_after": "5m0s"|' "$AUTOBAHN_CONFIG"
+  fi
+
   # Inject autobahn config file path into config.toml
   # Must be placed before any [section] header so TOML parser reads it as a top-level key.
   if grep -q "autobahn-config-file" ~/.sei/config/config.toml; then
diff --git a/sei-tendermint/cmd/tendermint/commands/gen_autobahn_config.go b/sei-tendermint/cmd/tendermint/commands/gen_autobahn_config.go
index 9297fa7a19..865abccf5d 100644
--- a/sei-tendermint/cmd/tendermint/commands/gen_autobahn_config.go
+++ b/sei-tendermint/cmd/tendermint/commands/gen_autobahn_config.go
@@ -77,6 +77,12 @@ Output is written to the file specified by --output.`,
 				AllowEmptyBlocks: true,
 				ViewTimeout:      utils.Duration(1500 * time.Millisecond),
 				DialInterval:     utils.Duration(10 * time.Second),
+				// data_prune_after caps the age of in-memory blocks/QCs/AppProposals
+				// in data.State. 30m gives operators plenty of recent history for
+				// /block, /tx, etc. while bounding memory under sustained load.
+				// Test setups (e.g. docker/localnode) can override this to a
+				// smaller value.
+				DataPruneAfter: utils.Some(utils.Duration(30 * time.Minute)),
 			}
 
 			data, err := json.MarshalIndent(cfg, "", "  ")
diff --git a/sei-tendermint/config/autobahn.go b/sei-tendermint/config/autobahn.go
index d27866828b..3aeb493f62 100644
--- a/sei-tendermint/config/autobahn.go
+++ b/sei-tendermint/config/autobahn.go
@@ -27,6 +27,9 @@ type AutobahnFileConfig struct {
 	ViewTimeout        utils.Duration       `json:"view_timeout"`
 	PersistentStateDir utils.Option[string] `json:"persistent_state_dir"`
 	DialInterval       utils.Duration       `json:"dial_interval"`
+	// DataPruneAfter is the age at which data.State drops in-memory blocks,
+	// QCs, and AppProposals; nil disables time-based pruning.
+	DataPruneAfter utils.Option[utils.Duration] `json:"data_prune_after"`
 }
 
 // Validate performs basic validation of the autobahn file config.
diff --git a/sei-tendermint/internal/p2p/giga_router.go b/sei-tendermint/internal/p2p/giga_router.go
index 5434979ab0..8479ad93f6 100644
--- a/sei-tendermint/internal/p2p/giga_router.go
+++ b/sei-tendermint/internal/p2p/giga_router.go
@@ -42,6 +42,12 @@ type GigaRouterConfig struct {
 	Producer       *producer.Config
 	TxMempool      *mempool.TxMempool
 	GenDoc         *types.GenesisDoc
+	// DataPruneAfter, when set, enables time-based pruning of in-memory
+	// data.State entries (blocks, AppProposals, QCs). Without it the
+	// in-memory window is bounded only by cosmos-sdk's RetainHeight via
+	// PruneBefore — which returns 0 for `pruning="nothing"` setups, leaving
+	// data.State to grow with the chain.
+	DataPruneAfter utils.Option[time.Duration]
 }
 
 type GigaRouter struct {
@@ -84,7 +90,10 @@ func NewGigaRouter(cfg *GigaRouterConfig, key NodeSecretKey) (*GigaRouter, error
 	if err != nil {
 		return nil, fmt.Errorf("data.NewDataWAL(): %w", err)
 	}
-	dataState, err := data.NewState(&data.Config{Committee: committee}, dataWAL)
+	dataState, err := data.NewState(&data.Config{
+		Committee:  committee,
+		PruneAfter: cfg.DataPruneAfter,
+	}, dataWAL)
 	if err != nil {
 		return nil, fmt.Errorf("data.NewState(): %w", err)
 	}
diff --git a/sei-tendermint/node/setup.go b/sei-tendermint/node/setup.go
index 142b9d2961..630e004a8f 100644
--- a/sei-tendermint/node/setup.go
+++ b/sei-tendermint/node/setup.go
@@ -240,7 +240,7 @@ func buildGigaConfig(
 	}
 	maxGasPerBlock := uint64(genDoc.ConsensusParams.Block.MaxGas) //nolint:gosec // validated > 0 above
 
-	return &p2p.GigaRouterConfig{
+	gigaCfg := &p2p.GigaRouterConfig{
 		DialInterval:   time.Duration(fc.DialInterval),
 		ValidatorAddrs: validatorAddrs,
 		Consensus: &autobahnConsensus.Config{
@@ -260,7 +260,11 @@ func buildGigaConfig(
 		},
 		TxMempool: txMempool,
 		GenDoc:    genDoc,
-	}, nil
+	}
+	if d, ok := fc.DataPruneAfter.Get(); ok {
+		gigaCfg.DataPruneAfter = utils.Some(time.Duration(d))
+	}
+	return gigaCfg, nil
 }
 
 func createRouter(