diff --git a/bin/df.sh b/bin/df.sh
new file mode 100755
index 0000000..df92638
--- /dev/null
+++ b/bin/df.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+docker run --network=host --ulimit memlock=-1 docker.dragonflydb.io/dragonflydb/dragonfly --maxmemory 1G "$@"
diff --git a/bin/reset_db_df.sh b/bin/reset_db_df.sh
new file mode 100755
index 0000000..6f2a5e2
--- /dev/null
+++ b/bin/reset_db_df.sh
@@ -0,0 +1 @@
+alembic downgrade -1 && alembic upgrade head && ./bin/df.sh
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 5ed5b4c..5d926be 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ sortedcontainers~=2.4.0
 hexbytes~=0.3.1
 defaultlist~=1.0.0
 redis[hiredis]
+socket.io-emitter
diff --git a/src/dexorder/__init__.py b/src/dexorder/__init__.py
index 3aee608..60b104c 100644
--- a/src/dexorder/__init__.py
+++ b/src/dexorder/__init__.py
@@ -4,6 +4,7 @@ from decimal import Decimal as dec
 class _NARG:
     def __bool__(self): return False
 NARG = _NARG()
+DELETE = object() # used as a value token to indicate removal of the key
 ADDRESS_0 = '0x0000000000000000000000000000000000000000'
 WEI  = 1
 GWEI = 1_000_000_000
diff --git a/src/dexorder/bin/main.py b/src/dexorder/bin/main.py
index 08cbac3..5a504a0 100644
--- a/src/dexorder/bin/main.py
+++ b/src/dexorder/bin/main.py
@@ -24,10 +24,10 @@ async def main():
     state = None
     if memcache:
         await memcache.connect()
-        redis_state = RedisState(BlockData.by_tag['redis'])
+        redis_state = RedisState(BlockData.by_opt('redis'))
     if db:
         db.connect()
-        db_state = DbState(BlockData.by_tag['db'])
+        db_state = DbState(BlockData.by_opt('db'))
         with db.session:
             state = db_state.load()
             if state is not None:
diff --git a/src/dexorder/blockstate/blockdata.py b/src/dexorder/blockstate/blockdata.py
index b9f22d5..8ca6757 100644
--- a/src/dexorder/blockstate/blockdata.py
+++ b/src/dexorder/blockstate/blockdata.py
@@ -1,11 +1,9 @@
 import logging
-from collections import defaultdict
 from enum import Enum
 from typing import TypeVar, Generic, Iterable, Union
 
-from dexorder import NARG
+from dexorder import NARG, DELETE
 from dexorder.base.fork import current_fork
-from .diff import DELETE
 from .state import current_blockstate
 
 log = logging.getLogger(__name__)
@@ -21,16 +19,13 @@ class DataType(Enum):
 
 class BlockData:
     registry: dict[str,'BlockData'] = {} # series name and instance
-    by_tag: dict[str, list['BlockData']] = defaultdict(list)
 
-    def __init__(self, series:str, data_type: DataType, **tags):
+    def __init__(self, series:str, data_type: DataType, **opts):
         assert series not in BlockData.registry
         BlockData.registry[series] = self
         self.series = series
         self.type = data_type
-        for tag, value in tags.items():
-            if value:
-                BlockData.by_tag[tag].append(self)
+        self.opts = opts
 
     def setitem(self, item, value, overwrite=True):
         state = current_blockstate.get()
@@ -58,6 +53,10 @@ class BlockData:
         fork = current_fork.get()
         return state.iteritems(fork, series_key)
 
+    @staticmethod
+    def by_opt(key):
+        yield from (s for s in BlockData.registry.values() if key in s.opts)
+
 
 class BlockSet(Generic[T], Iterable[T], BlockData):
     def __init__(self, series: str, **tags):
@@ -104,7 +103,7 @@ class BlockDict(Generic[T], BlockData):
 
 class SeriesCollection:
     def __init__(self, series_or_datavars: Iterable[Union[str,BlockData]]):
-        self.types = {
-            (d:=BlockData.registry[x] if type(x) is str else x).series:d.type
+        self.datas: dict[str,BlockData] = {
+            (d := BlockData.registry[x] if type(x) is str else x).series: d
             for x in series_or_datavars
         }
diff --git a/src/dexorder/blockstate/db_state.py b/src/dexorder/blockstate/db_state.py
index 385d468..1ed7b72 100644
--- a/src/dexorder/blockstate/db_state.py
+++ b/src/dexorder/blockstate/db_state.py
@@ -20,7 +20,7 @@ class DbState(SeriesCollection):
         chain_id = current_chain.get().chain_id
         for diff in diffs:
             try:
-                t = self.types[diff.series]
+                t = self.datas[diff.series].type
             except KeyError:
                 continue
             diffseries = keystr(diff.series)
@@ -60,7 +60,8 @@ class DbState(SeriesCollection):
         state = BlockState(root_block)
         current_blockstate.set(state)
         current_fork.set(None) # root fork
-        for series, t in self.types.items():
+        for series, data in self.datas.items():
+            t = data.type
             if t == DataType.SET:
                 # noinspection PyTypeChecker
                 var: BlockSet = BlockData.registry[series]
diff --git a/src/dexorder/blockstate/diff.py b/src/dexorder/blockstate/diff.py
index 05fb48f..6a0871a 100644
--- a/src/dexorder/blockstate/diff.py
+++ b/src/dexorder/blockstate/diff.py
@@ -1,8 +1,7 @@
 from dataclasses import dataclass
 from typing import Union, Any
 
-
-DELETE = object() # used as a value token to indicate removal of the key
+from dexorder import DELETE
 
 
 @dataclass
diff --git a/src/dexorder/data/__init__.py b/src/dexorder/data/__init__.py
index e6398bc..328c9df 100644
--- a/src/dexorder/data/__init__.py
+++ b/src/dexorder/data/__init__.py
@@ -1,7 +1,11 @@
 from dexorder.blockstate import BlockSet, BlockDict
 
-vault_addresses = BlockSet('v', db=True, redis=True)
-vault_tokens = BlockDict('vt', db=True, redis=True)
-pool_prices = BlockDict('p', db=True, redis=True)
+# pub=... publishes to a channel for web clients to consume. argument is (key,value) and return must be (event,room,value)
+#     if pub is True, then event is the current series name, room is the key, and value is passed through
+#     values of DELETE are serialized as nulls
+
+vault_addresses = BlockSet('v', db=True, redis=True, pub=True)
+vault_tokens = BlockDict('vt', db=True, redis=True, pub=True)
+pool_prices = BlockDict('p', db=True, redis=True, pub=True)
 underfunded_vaults = BlockSet('uv', db=True)
 active_orders = BlockSet('a', db=True)
diff --git a/src/dexorder/memcache/memcache_state.py b/src/dexorder/memcache/memcache_state.py
index 4eb77e0..bb0372e 100644
--- a/src/dexorder/memcache/memcache_state.py
+++ b/src/dexorder/memcache/memcache_state.py
@@ -1,8 +1,9 @@
 import logging
 from collections import defaultdict
-from typing import Iterable, Union, Reversible
+from typing import Iterable, Union, Reversible, Any
 
 from redis.asyncio.client import Pipeline
+from socket_io_emitter import Emitter
 
 from dexorder.base.chain import current_chain
 from dexorder.base.fork import current_fork
@@ -26,21 +27,21 @@ class RedisState (SeriesCollection):
 
     async def clear(self):
         r = current_redis.get()
-        await r.delete(f'{current_chain.get().chain_id}|latest_block', *self.types.keys())
+        await r.delete(f'{current_chain.get().chain_id}|latest_block', *self.datas.keys())
 
 
     async def init(self, state: BlockState):
         fork = current_fork.get()
         await self.clear()
         diffs = []
-        for series, t in self.types.items():
+        for series in self.datas.keys():
             for k, v in state.iteritems(fork, series):
                 diffs.append(DiffItem(series, k, v))
         await self.save(state.root_block, diffs)
 
 
     # noinspection PyAsyncCall
-    async def save(self, block: Block, diffs: Reversible[Union[DiffItem, DiffEntryItem]] ):
+    async def save(self, block: Block, diffs: Reversible[Union[DiffItem, DiffEntryItem]], *, publish=False ):
         # the diffs must be already compressed such that there is only one action per key
         chain = current_chain.get()
         assert block.chain == chain.chain_id
@@ -49,13 +50,25 @@ class RedisState (SeriesCollection):
         sdels: dict[str,set[str]] = defaultdict(set)
         hsets: dict[str,dict[str,str]] = defaultdict(dict)
         hdels: dict[str,set[str]] = defaultdict(set)
+        pubs: list[tuple[str,str,Any]] = [] # series, key, value => room, event, value
         for diff in compress_diffs(diffs):
             try:
-                t = self.types[diff.series]
+                d = self.datas[diff.series]
             except KeyError:
                 continue
+            t = d.type
             series = f'{chain_id}|{keystr(diff.series)}'
             key = keystr(diff.key)
+            value = keystr(diff.value)
+            # pub/sub socketio/redis
+            pub_kv = d.opts.get('pub')
+            if pub_kv is True:
+                pub_kv = key, value
+            elif callable(pub_kv):
+                pub_kv = pub_kv((key,value))
+            if pub_kv is not None:
+                # noinspection PyTypeChecker
+                pubs.append((series,*pub_kv))
             if diff.value is DELETE:
                 if t == DataType.SET:
                     sdels[series].add(key)
@@ -67,7 +80,7 @@ class RedisState (SeriesCollection):
                 if t == DataType.SET:
                     sadds[series].add(key)
                 elif t == DataType.DICT:
-                    hsets[series][key] = keystr(diff.value)
+                    hsets[series][key] = value
                 else:
                     raise NotImplementedError
         async with memcache.batch() as r:
@@ -80,5 +93,13 @@ class RedisState (SeriesCollection):
                 r.hset(series, mapping=kvs)
             for series, keys in hdels.items():
                 r.hdel(series, *keys)
-            r.json(json_encoder).set(f'{current_chain.get().chain_id}|latest_block','$',block.data)
-
+            block_series = f'{chain_id}|block.latest'
+            r.json(json_encoder).set(block_series,'$',block.data)
+            pubs.append((str(chain_id), 'block.latest', block.data))
+        # separate batch for
+        if pubs:
+            async with memcache.batch() as r:
+                r: Pipeline
+                io = Emitter(dict(client=r))
+                for s,k,v in pubs:
+                    io.To(s).Emit(k,v)
diff --git a/src/dexorder/util/json.py b/src/dexorder/util/json.py
index 9a688b9..d1895b0 100644
--- a/src/dexorder/util/json.py
+++ b/src/dexorder/util/json.py
@@ -6,6 +6,8 @@ from hexbytes import HexBytes
 from orjson import orjson
 from web3.datastructures import AttributeDict
 
+from dexorder import DELETE
+
 
 def _serialize(v):
     if type(v) is HexBytes:
@@ -16,6 +18,8 @@ def _serialize(v):
         return v.__dict__
     elif type(v) is Decimal:
         return f'{v:f}'
+    elif v is DELETE:
+        return None
     raise TypeError