diff --git a/ismism.ts/src/eid/db.ts b/ismism.ts/src/eid/db.ts
index 80a9930..125c357 100644
--- a/ismism.ts/src/eid/db.ts
+++ b/ismism.ts/src/eid/db.ts
@@ -1,17 +1,59 @@
 import { Collection, IndexOptions, MongoClient, UpdateFilter, Document } from "./mod.ts"
 import { Act, Agd, Aut, Dst, Lit, Ord, Soc, Usr, Video, Work, Wsl } from "./typ.ts"
 
+export type Coll<T extends Document> = Collection<T>
+export type Proj<T, P extends keyof T> = Partial<{ [K in P]: 0 } | { [K in P]: 1 }>
+export type Update<T> = UpdateFilter<T>
+export type DocC<_Id> = Promise<NonNullable<_Id> | null>
+export type DocR<Doc> = Promise<NonNullable<Doc> | null>
+export type DocU = Promise<0 | 1 | null>
+export type DocD = Promise<0 | 1 | null>
+
 const conn = new MongoClient()
 await conn.connect("mongodb://127.0.0.1:27017")
 
 export let coll = await db("tst", true)
 
-export type Coll<T extends Document> = Collection<T>
-export type Update<T> = UpdateFilter<T>
-export type DocC<_Id> = Promise<NonNullable<_Id> | null>
-export type DocR<Doc> = Promise<NonNullable<Doc> | null>
-export type DocU = Promise<0 | 1 | null>
-export type DocD = Promise<0 | 1 | null>
+export async function db(
+	dbnam: "ismism-dev" | "tst",
+	reset = false,
+) {
+	const db = conn.database(dbnam)
+	const c = {
+		usr: db.collection<Usr>("usr"),
+		agd: db.collection<Agd>("agd"),
+		soc: db.collection<Soc>("soc"),
+
+		work: db.collection<Work>("work"),
+		video: db.collection<Video>("video"),
+		ord: db.collection<Ord>("ord"),
+		dst: db.collection<Dst>("dst"),
+
+		wsl: db.collection<Wsl>("wsl"),
+		lit: db.collection<Lit>("lit"),
+
+		aut: db.collection<Aut>("aut"),
+		act: db.collection<Act>("act"),
+	}
+
+	if (reset) {
+		await db.dropDatabase()
+		await c.usr.createIndexes({ indexes: [...nam, ...nbr, ...re] })
+		await c.agd.createIndexes({ indexes: [...nam, ...adm, ...re, ...rel] })
+		await c.soc.createIndexes({ indexes: [...nam, ...adm, ...re, ...rel] })
+
+		await c.work.createIndexes({ indexes: [...rec] })
+		await c.video.createIndexes({ indexes: [...rec, ...live] })
+		await c.ord.createIndexes({ indexes: [...rec] })
+		await c.dst.createIndexes({ indexes: [...dst] })
+
+		await c.wsl.createIndexes({ indexes: [...md] })
+		await c.lit.createIndexes({ indexes: [...md] })
+	}
+
+	if (dbnam === "ismism-dev") coll = c
+	return c
+}
 
 const nam: IndexOptions[] = [{
 	key: { nam: 1 }, name: "nam", unique: true,
@@ -58,44 +100,3 @@ const md: IndexOptions[] = [{
 	key: { pin: 1, "utc.put": -1 }, name: "pin",
 	partialFilterExpression: { pin: { $exists: true } }
 }]
-
-export async function db(
-	dbnam: "ismism-dev" | "tst",
-	reset = false,
-) {
-	const db = conn.database(dbnam)
-	const c = {
-		usr: db.collection<Usr>("usr"),
-		agd: db.collection<Agd>("agd"),
-		soc: db.collection<Soc>("soc"),
-
-		work: db.collection<Work>("work"),
-		video: db.collection<Video>("video"),
-		ord: db.collection<Ord>("ord"),
-		dst: db.collection<Dst>("dst"),
-
-		wsl: db.collection<Wsl>("wsl"),
-		lit: db.collection<Lit>("lit"),
-
-		aut: db.collection<Aut>("aut"),
-		act: db.collection<Act>("act"),
-	}
-
-	if (reset) {
-		await db.dropDatabase()
-		await c.usr.createIndexes({ indexes: [...nam, ...nbr, ...re] })
-		await c.agd.createIndexes({ indexes: [...nam, ...adm, ...re, ...rel] })
-		await c.soc.createIndexes({ indexes: [...nam, ...adm, ...re, ...rel] })
-
-		await c.work.createIndexes({ indexes: [...rec] })
-		await c.video.createIndexes({ indexes: [...rec, ...live] })
-		await c.ord.createIndexes({ indexes: [...rec] })
-		await c.dst.createIndexes({ indexes: [...dst] })
-
-		await c.wsl.createIndexes({ indexes: [...md] })
-		await c.lit.createIndexes({ indexes: [...md] })
-	}
-
-	if (dbnam === "ismism-dev") coll = c
-	return c
-}
diff --git a/ismism.ts/src/eid/id.ts b/ismism.ts/src/eid/id.ts
new file mode 100644
index 0000000..ee5789a
--- /dev/null
+++ b/ismism.ts/src/eid/id.ts
@@ -0,0 +1,74 @@
+import type { Id } from "./typ.ts"
+import type { Coll, DocC, DocD, DocR, DocU, Proj, Update } from "./db.ts"
+import { is_id, is_intro, is_nam, is_utc } from "./is.ts"
+import { is_adm } from "../ont/adm.ts"
+
+export async function id_n<
+	T extends Id
+>(
+	c: Coll<T>
+): Promise<T["_id"]> {
+	const l = await c.findOne({}, { projection: { _id: 1 }, sort: { _id: -1 } })
+	return l ? l._id + 1 : 1
+}
+
+export async function id_c<
+	T extends Id
+>(
+	c: Coll<T>,
+	id: T,
+): DocC<T["_id"]> {
+	const is = is_id(id._id)
+		&& is_utc(id.utc)
+		&& (is_nam(id.nam) || id.nam === `${id._id}`)
+		&& is_adm(id.adm1, id.adm2)
+		&& is_intro(id.intro)
+	if (!is) return null
+	try { return await c.insertOne(id) as T["_id"] } catch { return null }
+}
+
+export async function id_r<
+	T extends Id,
+	P extends keyof T,
+>(
+	c: Coll<T>,
+	f: Partial<T>,
+	p: Proj<T, P>,
+): DocR<Pick<T, "_id" | P>> {
+	if (f._id && !is_id(f._id) || f.nam && !is_nam(f.nam)) return null
+	return await c.findOne(f, { projection: p }) ?? null
+}
+
+export async function id_u<
+	T extends Id
+>(
+	c: Coll<T>,
+	_id: T["_id"],
+	u: Update<T>,
+): DocU {
+	if (!is_id(_id)) return null
+	const s = u["$set"]
+	if (s) {
+		if (s.nam && !is_nam(s.nam)) return null
+		if ((s.adm1 || s.adm2) && !((s.adm1 && s.adm2) && is_adm(s.adm1, s.adm2))) return null
+		if (s.intro && !is_intro(s.intro)) return null
+	}
+	try { // deno-lint-ignore no-explicit-any
+		const { matchedCount, modifiedCount } = await c.updateOne({ _id } as any, u)
+		if (matchedCount > 0) return modifiedCount > 0 ? 1 : 0
+		else return null
+	} catch { return null }
+}
+
+export async function id_d<
+	T extends Id
+>(
+	c: Coll<T>,
+	_id: T["_id"],
+): DocD {
+	if (!is_id(_id)) return null
+	try { // deno-lint-ignore no-explicit-any
+		const d = await c.deleteOne({ _id } as any)
+		return d > 0 ? 1 : 0
+	} catch { return null }
+}
diff --git a/ismism.ts/src/eid/is.ts b/ismism.ts/src/eid/is.ts
index 14daaed..8af24a3 100644
--- a/ismism.ts/src/eid/is.ts
+++ b/ismism.ts/src/eid/is.ts
@@ -50,6 +50,11 @@ export function is_idl(
 ) {
 	return id.length <= lim && id.every(is_id)
 }
+export function is_utc(
+	utc: number
+) {
+	return Number.isInteger(utc)
+}
 export function is_nam(
 	nam: string
 ) {