MCP server (Bun) + 100K worker generator + lakehouse integration

MCP server at mcp-server/index.ts — 9 tools exposing the full
lakehouse to any MCP-compatible model:
  search_workers (hybrid SQL+vector), query_sql, match_contract,
  get_worker, rag_question, log_success, get_playbooks,
  swap_profile, vram_status

The "successful playbooks" pattern: log_success writes outcomes
back to the lakehouse as a queryable dataset. Small models call
get_playbooks to learn what approaches worked for similar tasks —
no retraining needed, just data.

generate_workers.py scales to 100K+ with realistic distributions:
  - 20 roles weighted by staffing industry frequency
  - 44 real Midwest/South cities across 12 states
  - Per-role skill pools (warehouse/production/machine/maintenance)
  - 13 certification types with realistic probability
  - 8 behavioral archetypes with score distributions
  - SMS communication templates (20 patterns)

100K worker dataset ingested: 70MB CSV → Parquet in 1.1s. Verified:
11K forklift ops, 27K in IL, archetype distribution matches weights.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.mcp.json

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+{
+  "mcpServers": {
+    "lakehouse": {
+      "command": "bun",
+      "args": ["run", "/home/profit/lakehouse/mcp-server/index.ts"],
+      "env": {
+        "LAKEHOUSE_URL": "http://localhost:3100"
+      }
+    }
+  }
+}

mcp-server/index.ts

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+/**
+ * Lakehouse MCP Server — bridges local LLMs to the data substrate.
+ *
+ * Tools:
+ * - search_workers: hybrid SQL+vector (the core fix)
+ * - query_sql: analytical SQL on any dataset
+ * - match_contract: find workers for a job order
+ * - get_worker: single worker by ID
+ * - rag_question: full RAG pipeline
+ * - log_success: record what worked → playbook DB
+ * - get_playbooks: retrieve past successes
+ * - swap_profile: hot-swap model + data context
+ * - vram_status: GPU introspection
+ */
+
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { z } from "zod";
+
+const BASE = process.env.LAKEHOUSE_URL || "http://localhost:3100";
+
+async function api(method: string, path: string, body?: any) {
+  const resp = await fetch(`${BASE}${path}`, {
+    method,
+    headers: body ? { "Content-Type": "application/json" } : {},
+    body: body ? JSON.stringify(body) : undefined,
+  });
+  const text = await resp.text();
+  try { return JSON.parse(text); } catch { return { raw: text, status: resp.status }; }
+}
+
+const server = new McpServer({ name: "lakehouse", version: "1.0.0" });
+
+server.tool(
+  "search_workers",
+  "Hybrid SQL+vector search. SQL ensures structural accuracy (role, state, reliability), vector ranks by semantic relevance. Every result is verified against the golden dataset.",
+  {
+    question: z.string().describe("Natural language question about workers"),
+    sql_filter: z.string().optional().describe("SQL WHERE clause, e.g. \"role = 'Forklift Operator' AND state = 'IL' AND reliability > 0.8\""),
+    dataset: z.string().default("ethereal_workers"),
+    id_column: z.string().default("worker_id"),
+    top_k: z.number().default(5),
+  },
+  async ({ question, sql_filter, dataset, id_column, top_k }) => {
+    const body: any = { question, index_name: "ethereal_workers_v1", filter_dataset: dataset, id_column, top_k, generate: true };
+    if (sql_filter) body.sql_filter = sql_filter;
+    const r = await api("POST", "/vectors/hybrid", body);
+    return { content: [{ type: "text" as const, text: JSON.stringify(r, null, 2) }] };
+  },
+);
+
+server.tool(
+  "query_sql",
+  "Run SQL against any lakehouse dataset. Tables: ethereal_workers (10K), candidates (100K), timesheets (1M), call_log (800K), email_log (500K), placements (50K), job_orders (15K), clients (2K).",
+  { sql: z.string().describe("SQL query") },
+  async ({ sql }) => {
+    const r = await api("POST", "/query/sql", { sql });
+    if (r.error) return { content: [{ type: "text" as const, text: `SQL Error: ${r.error}` }] };
+    return { content: [{ type: "text" as const, text: `${r.row_count} rows:\n${JSON.stringify(r.rows?.slice(0, 20), null, 2)}` }] };
+  },
+);
+
+server.tool(
+  "match_contract",
+  "Find qualified workers for a staffing contract. SQL-verified matches ranked by semantic fit.",
+  {
+    role: z.string(), state: z.string(), city: z.string().optional(),
+    min_reliability: z.number().default(0.7),
+    required_certs: z.array(z.string()).default([]),
+    headcount: z.number().default(5),
+  },
+  async ({ role, state, city, min_reliability, required_certs, headcount }) => {
+    let filter = `role = '${role}' AND state = '${state}' AND reliability >= ${min_reliability}`;
+    if (city) filter += ` AND city = '${city}'`;
+    const r = await api("POST", "/vectors/hybrid", {
+      question: `Find the best ${role} workers with relevant skills and certifications`,
+      index_name: "ethereal_workers_v1", sql_filter: filter,
+      filter_dataset: "ethereal_workers", id_column: "worker_id",
+      top_k: headcount * 2, generate: false,
+    });
+    let matches = r.sources || [];
+    if (required_certs.length > 0) {
+      const req = new Set(required_certs.map((c: string) => c.toLowerCase()));
+      matches = matches.filter((m: any) => {
+        const certs = (m.chunk_text || "").toLowerCase();
+        return [...req].every(c => certs.includes(c));
+      });
+    }
+    return { content: [{ type: "text" as const, text: JSON.stringify({
+      contract: { role, state, city, min_reliability, required_certs },
+      matches: matches.slice(0, headcount), total_sql: r.sql_matches, method: r.method,
+    }, null, 2) }] };
+  },
+);
+
+server.tool(
+  "get_worker",
+  "Fetch one worker profile by ID — all fields including scores and comms.",
+  { worker_id: z.number() },
+  async ({ worker_id }) => {
+    const r = await api("POST", "/query/sql", { sql: `SELECT * FROM ethereal_workers WHERE worker_id = ${worker_id}` });
+    if (!r.rows?.length) return { content: [{ type: "text" as const, text: `Worker ${worker_id} not found` }] };
+    return { content: [{ type: "text" as const, text: JSON.stringify(r.rows[0], null, 2) }] };
+  },
+);
+
+server.tool(
+  "rag_question",
+  "Natural language question answered via RAG (embed → search → retrieve → generate). For open-ended questions where SQL alone isn't enough.",
+  { question: z.string(), index: z.string().default("ethereal_workers_v1"), top_k: z.number().default(5) },
+  async ({ question, index, top_k }) => {
+    const r = await api("POST", "/vectors/rag", { index_name: index, question, top_k });
+    return { content: [{ type: "text" as const, text: r.error ? `RAG Error: ${r.error}` : `Answer: ${r.answer}\n\nSources: ${r.sources?.length || 0}` }] };
+  },
+);
+
+server.tool(
+  "log_success",
+  "Record a successful operation to the playbook database. Small models query this later to learn what worked.",
+  {
+    operation: z.string().describe("What was done"),
+    approach: z.string().describe("How it was done"),
+    result: z.string().describe("Outcome"),
+    context: z.string().optional(),
+  },
+  async ({ operation, approach, result, context }) => {
+    const csv = `timestamp,operation,approach,result,context\n"${new Date().toISOString()}","${operation.replace(/"/g, '""')}","${approach.replace(/"/g, '""')}","${result.replace(/"/g, '""')}","${(context||"").replace(/"/g, '""')}"`;
+    const form = new FormData();
+    form.append("file", new Blob([csv], { type: "text/csv" }), "playbook.csv");
+    const resp = await fetch(`${BASE}/ingest/file?name=successful_playbooks`, { method: "POST", body: form });
+    return { content: [{ type: "text" as const, text: `Logged: ${await resp.text()}` }] };
+  },
+);
+
+server.tool(
+  "get_playbooks",
+  "Retrieve past successful operations. Small models use this to learn what approaches worked.",
+  { keyword: z.string().optional(), limit: z.number().default(10) },
+  async ({ keyword, limit }) => {
+    let sql = `SELECT * FROM successful_playbooks ORDER BY timestamp DESC LIMIT ${limit}`;
+    if (keyword) sql = `SELECT * FROM successful_playbooks WHERE operation LIKE '%${keyword}%' OR approach LIKE '%${keyword}%' ORDER BY timestamp DESC LIMIT ${limit}`;
+    const r = await api("POST", "/query/sql", { sql });
+    if (r.error) return { content: [{ type: "text" as const, text: "No playbooks yet — log some successful operations first!" }] };
+    return { content: [{ type: "text" as const, text: JSON.stringify(r.rows, null, 2) }] };
+  },
+);
+
+server.tool(
+  "swap_profile",
+  "Hot-swap model profile. Changes Ollama model in VRAM + bound datasets. 'agent-parquet' = HNSW (fast), 'agent-lance' = IVF_PQ (scalable).",
+  { profile_id: z.string() },
+  async ({ profile_id }) => {
+    const r = await api("POST", `/vectors/profile/${profile_id}/activate`);
+    return { content: [{ type: "text" as const, text: JSON.stringify({
+      profile: r.profile_id, model: r.ollama_name,
+      indexes: r.indexes_warmed?.length, vectors: r.total_vectors,
+      previous: r.previous_profile, duration: r.duration_secs,
+    }, null, 2) }] };
+  },
+);
+
+server.tool(
+  "vram_status",
+  "GPU VRAM usage + loaded Ollama models. Check before swapping profiles.",
+  {},
+  async () => {
+    const r = await api("GET", "/ai/vram");
+    return { content: [{ type: "text" as const, text: JSON.stringify(r, null, 2) }] };
+  },
+);
+
+// Resources
+server.resource("lakehouse://datasets", "lakehouse://datasets", async (uri) => {
+  const r = await api("GET", "/catalog/datasets") as any[];
+  const text = r.map(d => `${d.name}: ${d.row_count || "?"} rows`).join("\n");
+  return { contents: [{ uri: uri.href, mimeType: "text/plain", text }] };
+});
+
+// Start
+async function main() {
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+  console.error(`Lakehouse MCP server started → ${BASE}`);
+  console.error("Tools: search_workers, query_sql, match_contract, get_worker, rag_question, log_success, get_playbooks, swap_profile, vram_status");
+}
+
+main().catch(console.error);

mcp-server/package.json

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+{
+  "name": "mcp-server",
+  "module": "index.ts",
+  "type": "module",
+  "private": true,
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  },
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.29.0"
+  }
+}

scripts/generate_workers.py

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+#!/usr/bin/env python3
+"""Generate realistic staffing worker profiles at scale.
+
+Usage:
+  python3 generate_workers.py 100000 > /tmp/workers_100k.csv
+  curl -X POST "http://localhost:3100/ingest/file?name=workers_100k" \
+       -F "file=@/tmp/workers_100k.csv"
+
+Design: combinatorial generation with industry-realistic distributions.
+No LLM dependency — runs in seconds. Each worker has:
+  - Unique name, email, phone
+  - Role drawn from weighted staffing-industry distribution
+  - City/state from real Midwest/South geography (staffing agency footprint)
+  - Skills per role (realistic combos, not random)
+  - Certifications with expiry dates
+  - Behavioral archetype + numeric scores
+  - SMS communication history (templated from real patterns)
+  - Resume summary text (for embedding)
+
+The generated data is designed to stress-test:
+  - SQL filters (WHERE role=X AND state=Y AND reliability>Z)
+  - Vector search (resume_text embeddings)
+  - Hybrid SQL+vector (structured + semantic together)
+  - Profile-scoped search (bound_datasets filtering)
+  - Concurrent query load at scale
+"""
+
+import csv, random, sys, hashlib
+from datetime import datetime, timedelta
+
+# ─── Configuration ───
+
+N = int(sys.argv[1]) if len(sys.argv) > 1 else 100000
+SEED = 2026
+random.seed(SEED)
+
+# ─── Realistic data pools ───
+
+FIRST_NAMES = [
+    "James", "Mary", "Robert", "Patricia", "John", "Jennifer", "Michael", "Linda",
+    "David", "Elizabeth", "William", "Barbara", "Richard", "Susan", "Joseph", "Jessica",
+    "Thomas", "Sarah", "Christopher", "Karen", "Charles", "Lisa", "Daniel", "Nancy",
+    "Matthew", "Betty", "Anthony", "Margaret", "Mark", "Sandra", "Donald", "Ashley",
+    "Steven", "Kimberly", "Paul", "Emily", "Andrew", "Donna", "Joshua", "Michelle",
+    "Kenneth", "Carol", "Kevin", "Amanda", "Brian", "Dorothy", "George", "Melissa",
+    "Timothy", "Deborah", "Ronald", "Stephanie", "Edward", "Rebecca", "Jason", "Sharon",
+    "Jeffrey", "Laura", "Ryan", "Cynthia", "Jacob", "Kathleen", "Gary", "Amy",
+    "Nicholas", "Angela", "Eric", "Shirley", "Jonathan", "Anna", "Stephen", "Brenda",
+    "Larry", "Pamela", "Justin", "Emma", "Scott", "Nicole", "Brandon", "Helen",
+    "Benjamin", "Samantha", "Samuel", "Katherine", "Raymond", "Christine", "Gregory", "Debra",
+    "Frank", "Rachel", "Alexander", "Carolyn", "Patrick", "Janet", "Jack", "Catherine",
+    "Dennis", "Maria", "Jerry", "Heather", "Tyler", "Diane", "Aaron", "Ruth",
+    "Jose", "Julie", "Adam", "Olivia", "Nathan", "Joyce", "Henry", "Virginia",
+    "Douglas", "Victoria", "Zachary", "Kelly", "Peter", "Lauren", "Kyle", "Christina",
+    "Jamal", "Terrence", "Marcus", "DeShawn", "Malik", "Andre", "Carlos", "Miguel",
+    "Luis", "Sofia", "Rosa", "Carmen", "Alejandro", "Roberto", "Priya", "Aisha",
+    "Wei", "Yuki", "Omar", "Fatima", "Raj", "Mei", "Olga", "Ivan",
+]
+
+LAST_NAMES = [
+    "Smith", "Johnson", "Williams", "Brown", "Jones", "Garcia", "Miller", "Davis",
+    "Rodriguez", "Martinez", "Hernandez", "Lopez", "Gonzalez", "Wilson", "Anderson",
+    "Thomas", "Taylor", "Moore", "Jackson", "Martin", "Lee", "Perez", "Thompson",
+    "White", "Harris", "Sanchez", "Clark", "Ramirez", "Lewis", "Robinson", "Walker",
+    "Young", "Allen", "King", "Wright", "Scott", "Torres", "Nguyen", "Hill",
+    "Flores", "Green", "Adams", "Nelson", "Baker", "Hall", "Rivera", "Campbell",
+    "Mitchell", "Carter", "Roberts", "Gomez", "Phillips", "Evans", "Turner", "Diaz",
+    "Parker", "Cruz", "Edwards", "Collins", "Reyes", "Stewart", "Morris", "Morales",
+    "Murphy", "Cook", "Rogers", "Gutierrez", "Ortiz", "Morgan", "Cooper", "Peterson",
+    "Bailey", "Reed", "Kelly", "Howard", "Ramos", "Kim", "Cox", "Ward",
+    "Richardson", "Watson", "Brooks", "Chavez", "Wood", "James", "Bennett", "Gray",
+    "Mendoza", "Ruiz", "Hughes", "Price", "Alvarez", "Castillo", "Sanders", "Patel",
+    "Myers", "Long", "Ross", "Foster", "Jimenez", "Powell", "Jenkins", "Perry",
+]
+
+# Real Midwest/South cities — staffing agency footprint
+CITIES = [
+    ("Chicago", "IL", "606"), ("Springfield", "IL", "627"), ("Rockford", "IL", "611"),
+    ("Peoria", "IL", "616"), ("Champaign", "IL", "618"), ("Decatur", "IL", "625"),
+    ("Bloomington", "IL", "617"), ("Joliet", "IL", "604"), ("Mattoon", "IL", "619"),
+    ("Danville", "IL", "618"), ("Quincy", "IL", "623"), ("Galesburg", "IL", "614"),
+    ("Indianapolis", "IN", "462"), ("Fort Wayne", "IN", "468"), ("Evansville", "IN", "477"),
+    ("South Bend", "IN", "466"), ("Terre Haute", "IN", "478"), ("Bloomington", "IN", "474"),
+    ("Columbus", "OH", "432"), ("Cleveland", "OH", "441"), ("Cincinnati", "OH", "452"),
+    ("Dayton", "OH", "454"), ("Toledo", "OH", "436"), ("Akron", "OH", "443"),
+    ("St. Louis", "MO", "631"), ("Kansas City", "MO", "641"), ("Springfield", "MO", "658"),
+    ("Columbia", "MO", "652"), ("Jefferson City", "MO", "651"),
+    ("Nashville", "TN", "372"), ("Memphis", "TN", "381"), ("Knoxville", "TN", "379"),
+    ("Louisville", "KY", "402"), ("Lexington", "KY", "405"),
+    ("Milwaukee", "WI", "532"), ("Madison", "WI", "537"), ("Green Bay", "WI", "543"),
+    ("Detroit", "MI", "481"), ("Grand Rapids", "MI", "495"), ("Lansing", "MI", "489"),
+    ("Des Moines", "IA", "503"), ("Cedar Rapids", "IA", "524"),
+    ("Minneapolis", "MN", "554"), ("St. Paul", "MN", "551"),
+]
+
+# Roles with industry-realistic weights
+ROLES = [
+    ("Forklift Operator", 12), ("Material Handler", 11), ("Machine Operator", 10),
+    ("Assembler", 9), ("Production Worker", 9), ("Warehouse Associate", 8),
+    ("Quality Tech", 7), ("Shipping Clerk", 6), ("Loader", 6),
+    ("Inventory Clerk", 5), ("Line Lead", 4), ("Maintenance Tech", 4),
+    ("Welder", 3), ("CNC Operator", 3), ("Sanitation Worker", 3),
+    ("Packaging Operator", 3), ("Electrician", 2), ("Tool & Die Maker", 2),
+    ("Safety Coordinator", 1), ("Logistics Coordinator", 1),
+]
+ROLE_NAMES = [r for r, _ in ROLES]
+ROLE_WEIGHTS = [w for _, w in ROLES]
+
+# Skills per role family (realistic combos)
+SKILL_POOLS = {
+    "warehouse": ["forklift", "pallet jack", "RF scanner", "inventory", "shipping",
+                   "receiving", "pick-to-light", "packaging", "cold storage", "loading dock"],
+    "production": ["assembly", "line work", "quality inspection", "lean manufacturing",
+                    "6S", "SPC", "conveyor ops", "batch processing", "labeling"],
+    "machine": ["CNC", "lathe", "mill", "grinder", "press brake", "EDM",
+                 "blueprint reading", "GD&T", "micrometer", "calipers"],
+    "maintenance": ["preventive maintenance", "troubleshooting", "PLC", "electrical",
+                     "hydraulics", "pneumatics", "welding", "lockout/tagout", "CMMS"],
+    "quality": ["inspection", "CMM", "SPC", "gauge R&R", "ISO 9001", "root cause analysis",
+                 "first article", "nonconformance", "calibration"],
+    "general": ["Excel", "SAP", "first aid", "hazmat", "confined space",
+                 "overhead crane", "team lead", "training", "bilingual"],
+}
+
+ROLE_SKILL_MAP = {
+    "Forklift Operator": ["warehouse", "general"],
+    "Material Handler": ["warehouse", "general"],
+    "Machine Operator": ["machine", "production"],
+    "Assembler": ["production", "quality"],
+    "Production Worker": ["production", "general"],
+    "Warehouse Associate": ["warehouse", "general"],
+    "Quality Tech": ["quality", "production"],
+    "Shipping Clerk": ["warehouse", "general"],
+    "Loader": ["warehouse", "general"],
+    "Inventory Clerk": ["warehouse", "general"],
+    "Line Lead": ["production", "general"],
+    "Maintenance Tech": ["maintenance", "general"],
+    "Welder": ["maintenance", "machine"],
+    "CNC Operator": ["machine", "quality"],
+    "Sanitation Worker": ["general"],
+    "Packaging Operator": ["production", "warehouse"],
+    "Electrician": ["maintenance"],
+    "Tool & Die Maker": ["machine", "maintenance"],
+    "Safety Coordinator": ["quality", "general"],
+    "Logistics Coordinator": ["warehouse", "general"],
+}
+
+CERTS = [
+    ("OSHA-10", 0.35), ("OSHA-30", 0.15), ("Forklift", 0.30), ("Hazmat", 0.12),
+    ("First Aid/CPR", 0.25), ("Reach Truck", 0.10), ("Order Picker", 0.08),
+    ("ServSafe", 0.05), ("MSDS", 0.07), ("Confined Space", 0.06),
+    ("Lockout/Tagout", 0.08), ("Fire Safety", 0.04), ("ISO 9001", 0.03),
+]
+
+ARCHETYPES = [
+    ("reliable", 25), ("communicator", 25), ("flexible", 20),
+    ("leader", 15), ("specialist", 10), ("improving", 3),
+    ("erratic", 1), ("silent", 1),
+]
+ARCHETYPE_NAMES = [a for a, _ in ARCHETYPES]
+ARCHETYPE_WEIGHTS = [w for _, w in ARCHETYPES]
+
+SMS_TEMPLATES = [
+    "On my way, running about {min} minutes late.",
+    "Got it, I'll be there at {time}.",
+    "Can I switch to the {shift} shift this week?",
+    "Thanks for the update!",
+    "Is overtime available this Saturday?",
+    "I need to call in tomorrow, family emergency.",
+    "Stuck in traffic on I-{highway}, might be {min} late.",
+    "Hey, just confirming my start time is {time}?",
+    "I finished the {task} ahead of schedule.",
+    "Can you send me the address for the new site?",
+    "Do I need steel toes for this assignment?",
+    "What's the dress code at {client}?",
+    "My certification expires next month, where do I renew?",
+    "I'm available for any extra shifts this week.",
+    "Is there parking on site or do I need to take the bus?",
+    "The supervisor said I did great today!",
+    "I have a doctor's appointment {day}, can I come in late?",
+    "Weather looks bad tomorrow, is the site still open?",
+    "I completed the safety orientation.",
+    "Thanks for getting me this placement, really appreciate it.",
+]
+
+CLIENTS = [
+    "Midwest Logistics", "Precision Mfg", "AutoParts Direct", "CleanSpace",
+    "Summit Packaging", "Great Lakes Steel", "Heartland Foods", "Prairie Wind Energy",
+    "River City Plastics", "Cardinal Health", "TechFlow Assembly", "Union Pacific",
+]
+
+# ─── Generator ───
+
+def gen_skills(role):
+    pools = ROLE_SKILL_MAP.get(role, ["general"])
+    skills = set()
+    for pool in pools:
+        available = SKILL_POOLS.get(pool, [])
+        n = random.randint(2, min(5, len(available)))
+        skills.update(random.sample(available, n))
+    return sorted(skills)
+
+def gen_certs():
+    certs = []
+    for name, prob in CERTS:
+        if random.random() < prob:
+            expires = datetime(2026, 1, 1) + timedelta(days=random.randint(30, 730))
+            certs.append(f"{name}")
+    return certs
+
+def gen_scores(archetype):
+    base = {
+        "reliable": (0.85, 0.05), "communicator": (0.70, 0.10),
+        "flexible": (0.75, 0.08), "leader": (0.80, 0.07),
+        "specialist": (0.78, 0.06), "improving": (0.60, 0.15),
+        "erratic": (0.40, 0.20), "silent": (0.65, 0.12),
+    }
+    mean, std = base.get(archetype, (0.70, 0.10))
+    return {
+        "reliability": max(0, min(1, random.gauss(mean, std))),
+        "responsiveness": max(0, min(1, random.gauss(mean - 0.05, std + 0.05))),
+        "engagement": max(0, min(1, random.gauss(mean - 0.03, std))),
+        "compliance": max(0, min(1, random.gauss(mean + 0.02, std - 0.02))),
+        "availability": max(0, min(1, random.gauss(0.75, 0.15))),
+    }
+
+def gen_comms(archetype, n=5):
+    if archetype == "silent":
+        n = random.randint(0, 1)
+    elif archetype == "communicator":
+        n = random.randint(5, 10)
+    msgs = []
+    for _ in range(n):
+        tmpl = random.choice(SMS_TEMPLATES)
+        msg = tmpl.format(
+            min=random.randint(5, 25),
+            time=f"{random.randint(5,8)}:{random.choice(['00','15','30','45'])} AM",
+            shift=random.choice(["morning", "evening", "night"]),
+            highway=random.randint(55, 94),
+            task=random.choice(["pallet count", "safety check", "machine setup", "inventory audit"]),
+            client=random.choice(CLIENTS),
+            day=random.choice(["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]),
+        )
+        msgs.append(msg)
+    return " | ".join(msgs)
+
+def gen_email(first, last, wid):
+    domain = random.choice(["gmail.com", "yahoo.com", "outlook.com", "protonmail.com", "mail.com"])
+    tag = random.choice(["", str(random.randint(1,99)), str(wid)])
+    return f"{first.lower()}.{last.lower()}{tag}@{domain}"
+
+def gen_phone():
+    area = random.choice([312,773,217,309,618,219,317,812,614,513,216,314,615,502,414,608,313,515,612])
+    return f"+1{area}{random.randint(2000000,9999999)}"
+
+# ─── Main ───
+
+writer = csv.writer(sys.stdout)
+writer.writerow([
+    "worker_id", "name", "role", "email", "phone", "city", "state", "zip",
+    "skills", "certifications", "archetype",
+    "reliability", "responsiveness", "engagement", "compliance", "availability",
+    "communications", "resume_text",
+])
+
+for i in range(1, N + 1):
+    first = random.choice(FIRST_NAMES)
+    last = random.choice(LAST_NAMES)
+    # At scale, names repeat — that's realistic. Worker ID is the unique key.
+    # Add middle initial for variety above 15K workers.
+    if i > 15000:
+        mid = chr(65 + (i % 26))  # A-Z
+        name = f"{first} {mid}. {last}"
+    else:
+        name = f"{first} {last}"
+
+    role = random.choices(ROLE_NAMES, weights=ROLE_WEIGHTS, k=1)[0]
+    city, state, zip_pre = random.choice(CITIES)
+    zipcode = f"{zip_pre}{random.randint(10,99)}"
+    skills = gen_skills(role)
+    certs = gen_certs()
+    archetype = random.choices(ARCHETYPE_NAMES, weights=ARCHETYPE_WEIGHTS, k=1)[0]
+    scores = gen_scores(archetype)
+    comms = gen_comms(archetype)
+
+    resume = (
+        f"{name} — {role} in {city}, {state}. "
+        f"Skills: {'|'.join(skills)}. "
+        f"Certs: {'|'.join(certs) if certs else 'none'}. "
+        f"Archetype: {archetype}. "
+        f"Reliability: {scores['reliability']:.2f}, "
+        f"Availability: {scores['availability']:.2f}"
+    )
+
+    writer.writerow([
+        i, name, role, gen_email(first, last, i), gen_phone(),
+        city, state, zipcode,
+        ", ".join(skills), ", ".join(certs), archetype,
+        f"{scores['reliability']:.4f}", f"{scores['responsiveness']:.4f}",
+        f"{scores['engagement']:.4f}", f"{scores['compliance']:.4f}",
+        f"{scores['availability']:.4f}",
+        comms, resume,
+    ])
+
+    if i % 25000 == 0:
+        print(f"  generated {i:,}/{N:,}...", file=sys.stderr)
+
+print(f"Done: {N:,} workers", file=sys.stderr)