diff --git a/lib/index.js b/lib/index.js
index 1b65345..64cdb2f 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -2,12 +2,35 @@ const MsgV3 = require('ppppp-db/msg-v3')
 
 const PREFIX = 'record_v1__'
 
+/**
+ * @typedef {import('ppppp-db').Msg} Msg
+ * @typedef {ReturnType<import('ppppp-db').init>} PPPPPDB
+ * @typedef {import('ppppp-db').RecPresent} RecPresent
+ * @typedef {{
+ *   hook: (
+ *     cb: (
+ *       this: any,
+ *       fn: (this: any, ...a: Array<any>) => any,
+ *       args: Array<any>
+ *     ) => void
+ *   ) => void
+ * }} ClosableHook
+ */
+
 /**
  * @typedef {string} Subdomain
  * @typedef {string} MsgID
  * @typedef {`${Subdomain}.${string}`} SubdomainField
  */
 
+/**
+ * @template T
+ * @typedef {T extends void ?
+ *   (...args: [Error] | []) => void :
+ *   (...args: [Error] | [null, T]) => void
+ * } CB
+ */
+
 /**
  * @param {string} domain
  * @returns {Subdomain}
@@ -24,43 +47,86 @@ function fromSubdomain(subdomain) {
   return PREFIX + subdomain
 }
 
+/**
+ * @param {{
+ *   db: PPPPPDB | null,
+ *   close: ClosableHook,
+ * }} peer
+ * @returns {asserts peer is { db: PPPPPDB, close: ClosableHook }}
+ */
+function assertDBExists(peer) {
+  if (!peer.db) throw new Error('record plugin requires ppppp-db plugin')
+}
+
 module.exports = {
   name: 'record',
   manifest: {},
+
+  /**
+   * @param {{
+   *   db: PPPPPDB | null,
+   *   close: ClosableHook,
+   * }} peer
+   * @param {any} config
+   */
   init(peer, config) {
+    assertDBExists(peer)
+
     //#region state
     let accountID = /** @type {string | null} */ (null)
-    let cancelListeningToRecordAdded = null
+    let cancelOnRecordAdded = /** @type {CallableFunction | null} */ (null)
     let loadPromise = /** @type {Promise<void> | null} */ (null)
-    const tangles = /** @type {Map<Subdomain, unknown>} */ (new Map())
+    const tangles = /** @type {Map<Subdomain, MsgV3.Tangle>} */ (new Map())
 
     const fieldRoots = {
-      /** @type {Map<SubdomainField, Set<MsgID>} */
-      _map: new Map(),
+      _map: /** @type {Map<SubdomainField, Set<MsgID>>} */ (new Map()),
+      /**
+       * @param {string} subdomain
+       * @param {string} field
+       * @returns {SubdomainField}
+       */
       _getKey(subdomain, field) {
-        return subdomain + '.' + field
+        return `${subdomain}.${field}`
       },
-      get(subdomain, field = null) {
-        if (field) {
-          const key = this._getKey(subdomain, field)
-          return this._map.get(key)
-        } else {
-          const out = {}
-          for (const [key, value] of this._map.entries()) {
-            if (key.startsWith(subdomain + '.')) {
-              const field = key.slice(subdomain.length + 1)
-              out[field] = [...value]
-            }
+      /**
+       * @param {string} subdomain
+       * @returns {Record<string, Array<MsgID>>}
+       */
+      getAll(subdomain) {
+        const out = /** @type {Record<string, Array<MsgID>>} */ ({})
+        for (const [key, value] of this._map.entries()) {
+          if (key.startsWith(subdomain + '.')) {
+            const field = key.slice(subdomain.length + 1)
+            out[field] = [...value]
           }
-          return out
         }
+        return out
       },
+      /**
+       * @param {string} subdomain
+       * @param {string} field
+       * @returns {Set<MsgID> | undefined}
+       */
+      get(subdomain, field) {
+        const key = this._getKey(subdomain, field)
+        return this._map.get(key)
+      },
+      /**
+       * @param {string} subdomain
+       * @param {string} field
+       * @param {MsgID} msgID
+       */
       add(subdomain, field, msgID) {
         const key = this._getKey(subdomain, field)
         const set = this._map.get(key) ?? new Set()
         set.add(msgID)
         return this._map.set(key, set)
       },
+      /**
+       * @param {string} subdomain
+       * @param {string} field
+       * @param {MsgID} msgID
+       */
       del(subdomain, field, msgID) {
         const key = this._getKey(subdomain, field)
         const set = this._map.get(key)
@@ -77,13 +143,18 @@ module.exports = {
 
     //#region active processes
     peer.close.hook(function (fn, args) {
-      cancelListeningToRecordAdded()
+      cancelOnRecordAdded?.()
       fn.apply(this, args)
     })
     //#endregion
 
     //#region internal methods
-    function isValidRecordRootMsg(msg) {
+    /**
+     * @private
+     * @param {Msg | null | undefined} msg
+     * @returns {msg is Msg}
+     */
+    function isValidRecordMoot(msg) {
       if (!msg) return false
       if (msg.metadata.account !== accountID) return false
       const domain = msg.metadata.domain
@@ -91,6 +162,11 @@ module.exports = {
       return MsgV3.isMoot(msg, accountID, domain)
     }
 
+    /**
+     * @private
+     * @param {Msg | null | undefined} msg
+     * @returns {msg is Msg}
+     */
     function isValidRecordMsg(msg) {
       if (!msg) return false
       if (!msg.data) return false
@@ -103,6 +179,11 @@ module.exports = {
       return true
     }
 
+    /**
+     * @private
+     * @param {string} rootID
+     * @param {Msg} root
+     */
     function learnRecordRoot(rootID, root) {
       const subdomain = toSubdomain(root.metadata.domain)
       const tangle = tangles.get(subdomain) ?? new MsgV3.Tangle(rootID)
@@ -110,6 +191,11 @@ module.exports = {
       tangles.set(subdomain, tangle)
     }
 
+    /**
+     * @private
+     * @param {string} msgID
+     * @param {Msg} msg
+     */
     function learnRecordUpdate(msgID, msg) {
       const { account, domain } = msg.metadata
       const rootID = MsgV3.getMootID(account, domain)
@@ -135,9 +221,14 @@ module.exports = {
       }
     }
 
+    /**
+     * @private
+     * @param {string} msgID
+     * @param {Msg} msg
+     */
     function maybeLearnAboutRecord(msgID, msg) {
       if (msg.metadata.account !== accountID) return
-      if (isValidRecordRootMsg(msg)) {
+      if (isValidRecordMoot(msg)) {
         learnRecordRoot(msgID, msg)
         return
       }
@@ -147,12 +238,24 @@ module.exports = {
       }
     }
 
+    /**
+     * @private
+     * @param {CB<void>} cb
+     * @returns
+     */
     function loaded(cb) {
       if (cb === void 0) return loadPromise
-      else loadPromise.then(() => cb(null), cb)
+      else loadPromise?.then(() => cb(), cb)
     }
 
+    /**
+     * @private
+     * @param {string} subdomain
+     * @returns {number}
+     */
     function _squeezePotential(subdomain) {
+      assertDBExists(peer)
+      if (!accountID) throw new Error('Cannot squeeze potential before loading')
       // TODO: improve this so that the squeezePotential is the size of the
       // tangle suffix built as a slice from the fieldRoots
       const mootID = MsgV3.getMootID(accountID, fromSubdomain(subdomain))
@@ -169,7 +272,14 @@ module.exports = {
       return maxDepth - minDepth
     }
 
+    /**
+     * @param {string} subdomain
+     * @param {Record<string, any>} update
+     * @param {CB<boolean>} cb
+     */
     function forceUpdate(subdomain, update, cb) {
+      assertDBExists(peer)
+      if (!accountID) throw new Error('Cannot force update before loading')
       const domain = fromSubdomain(subdomain)
 
       // Populate supersedes
@@ -184,6 +294,7 @@ module.exports = {
         (err, rec) => {
           // prettier-ignore
           if (err) return cb(new Error('Failed to create msg when force updating Record', { cause: err }))
+          // @ts-ignore
           cb(null, true)
         }
       )
@@ -194,34 +305,49 @@ module.exports = {
 
     /**
      * @param {string} id
+     * @param {CB<void>} cb
      */
     function load(id, cb) {
+      assertDBExists(peer)
       accountID = id
       loadPromise = new Promise((resolve, reject) => {
-        for (const { id, msg } of peer.db.records()) {
-          maybeLearnAboutRecord(id, msg)
+        for (const rec of peer.db.records()) {
+          if (!rec.msg) continue
+          maybeLearnAboutRecord(rec.id, rec.msg)
         }
-        cancelListeningToRecordAdded = peer.db.onRecordAdded(({ id, msg }) => {
-          maybeLearnAboutRecord(id, msg)
+        cancelOnRecordAdded = peer.db.onRecordAdded(
+          (/** @type {RecPresent} */ rec) => {
+          if (!rec.msg) return
+          maybeLearnAboutRecord(rec.id, rec.msg)
         })
         resolve()
         cb()
       })
     }
 
+    /**
+     * @param {string} id
+     * @param {string} subdomain
+     */
     function getFieldRoots(id, subdomain) {
       // prettier-ignore
-      if (id !== accountID) return cb(new Error(`Cannot getFieldRoots for another user's record. Given ID was "${id}"`))
-      return fieldRoots.get(subdomain)
+      if (id !== accountID) throw new Error(`Cannot getFieldRoots for another user's record. Given ID was "${id}"`)
+      return fieldRoots.getAll(subdomain)
     }
 
+    /**
+     * @public
+     * @param {string} id
+     * @param {string} subdomain
+     */
     function get(id, subdomain) {
+      assertDBExists(peer)
       const domain = fromSubdomain(subdomain)
       const mootID = MsgV3.getMootID(id, domain)
       const tangle = peer.db.getTangle(mootID)
       if (!tangle || tangle.size === 0) return {}
       const msgIDs = tangle.topoSort()
-      const record = {}
+      const record = /** @type {Record<string, any>}*/ ({})
       for (const msgID of msgIDs) {
         const msg = peer.db.get(msgID)
         if (isValidRecordMsg(msg)) {
@@ -232,6 +358,13 @@ module.exports = {
       return record
     }
 
+    /**
+     * @public
+     * @param {string} id
+     * @param {string} subdomain
+     * @param {Record<string, any>} update
+     * @param {CB<boolean>} cb
+     */
     function update(id, subdomain, update, cb) {
       // prettier-ignore
       if (id !== accountID) return cb(new Error(`Cannot update another user's record. Given ID was "${id}"`))
@@ -251,6 +384,11 @@ module.exports = {
       })
     }
 
+    /**
+     * @param {string} id
+     * @param {string} subdomain
+     * @param {CB<boolean>} cb
+     */
     function squeeze(id, subdomain, cb) {
       // prettier-ignore
       if (id !== accountID) return cb(new Error(`Cannot squeeze another user's record. Given ID was "${id}"`))
@@ -259,9 +397,10 @@ module.exports = {
 
       loaded(() => {
         const record = get(id, subdomain)
-        forceUpdate(subdomain, record, (err) => {
+        forceUpdate(subdomain, record, (err, _forceUpdated) => {
           // prettier-ignore
           if (err) return cb(new Error('Failed to force update when squeezing Record', { cause: err }))
+          // @ts-ignore
           cb(null, true)
         })
       })
diff --git a/package.json b/package.json
index 7d983a7..2df030b 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
   "devDependencies": {
     "bs58": "^5.0.0",
     "c8": "7",
-    "ppppp-db": "github:staltz/ppppp-db",
+    "ppppp-db": "file:../db",
     "ppppp-caps": "github:staltz/ppppp-caps",
     "ppppp-keypair": "github:staltz/ppppp-keypair",
     "rimraf": "^4.4.0",