diff --git a/dev/.gitignore b/dev/.gitignore
new file mode 100644
index 000000000..6053ae8d1
--- /dev/null
+++ b/dev/.gitignore
@@ -0,0 +1,3 @@
+/logs/
+/run/
+/data-store/
diff --git a/dev/Makefile b/dev/Makefile
new file mode 100644
index 000000000..95c9b888c
--- /dev/null
+++ b/dev/Makefile
@@ -0,0 +1,99 @@
+# dev/Makefile — local launch of seq-db (store) + seq-proxy.
+#
+# A Makefile equivalent of dev/dev.sh (the original sh script is kept unchanged).
+# Processes run as a PLAIN binary (no headless-delve); debugging is done via
+# VS Code: "Attach to Go process (pick)" lists store/proxy (dlv attach).
+#
+#   make up            build the debug binary and start store + proxy
+#   make down          stop
+#   make status        show process status and PIDs
+#   make logs          tail both logs (or: make logs name=proxy)
+#   make build         build the debug binary only
+#   make restart       down + up
+#
+# Run from dev/ or via `make -C dev <target>` from the repo root.
+#
+# GNU Make 3.81 (macOS) without .ONESHELL passes each recipe line to a separate
+# shell, but a backslash+newline joins lines into one. So bash function bodies
+# (which need real newlines) live in dev/_helpers.sh and are loaded via `source`;
+# everything linear is written straight in the recipe with `; \`.
+#
+SHELL := /bin/bash
+
+DEV  := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
+ROOT := $(abspath $(DEV)/..)
+RUN  := $(DEV)/run
+LOG  := $(DEV)/logs
+DATA := $(DEV)/data-store
+
+OS   := $(shell uname -s | tr '[:upper:]' '[:lower:]')
+ARCH := $(shell uname -m | tr '[:upper:]' '[:lower:]')
+ifeq ($(ARCH), x86_64)
+ARCH := amd64
+endif
+ifeq ($(ARCH), aarch64)
+ARCH := arm64
+endif
+BIN := $(ROOT)/bin/$(OS)-$(ARCH)/seq-db
+
+STORE_CFG := $(DEV)/config.store.yaml
+PROXY_CFG := $(DEV)/config.proxy.yaml
+STORE_GRPC_PORT := 9104
+
+# Export paths into the environment — the functions in _helpers.sh read them.
+export DEV ROOT RUN LOG BIN
+
+name ?=
+
+.DEFAULT_GOAL := help
+
+.PHONY: help build up down status logs restart
+
+help:
+	@echo "usage: make {up|down|status|logs [name=store|proxy]|build|restart}"
+
+build:
+	@source "$$DEV/_helpers.sh"; \
+	log "building debug binary -> $(BIN)"; \
+	cd "$(ROOT)"; \
+	CGO_ENABLED=0 go build -gcflags="all=-N -l" -o "$(BIN)" ./cmd/seq-db
+
+up: build
+	@source "$$DEV/_helpers.sh"; \
+	cd "$(DEV)"; \
+	mkdir -p "$(DATA)" "$(RUN)" "$(LOG)"; \
+	start_one store "$(STORE_CFG)" store; \
+	wait_port "$(STORE_GRPC_PORT)" store; \
+	start_one proxy "$(PROXY_CFG)" proxy; \
+	log "ready. Debug via VS Code: \"Attach to Go process (pick)\"."; \
+	log "  store  pid=$$(cat "$(RUN)/store.pid")  grpc=:$(STORE_GRPC_PORT)  log=$(LOG)/store.log"; \
+	log "  proxy  pid=$$(cat "$(RUN)/proxy.pid")  http=:9002 grpc=:9004   log=$(LOG)/proxy.log"; \
+	log "  clients -> http://localhost:9002  grpc://localhost:9004"; \
+	log "  stop: make down"
+
+down:
+	@source "$$DEV/_helpers.sh"; \
+	stop_one proxy; \
+	stop_one store; \
+	log "stopped."
+
+status:
+	@source "$$DEV/_helpers.sh"; \
+	for name in store proxy; do \
+	  if is_running "$$name"; then \
+	    log "$$name: running (pid $$(cat "$(RUN)/$$name.pid"))"; \
+	  else \
+	    log "$$name: stopped"; \
+	  fi; \
+	done
+
+logs:
+	@source "$$DEV/_helpers.sh"; \
+	if [[ -z "$(name)" ]]; then \
+	  tail -n 200 "$(LOG)/store.log" "$(LOG)/proxy.log" 2>/dev/null || err "no logs"; \
+	else \
+	  tail -n 200 -f "$(LOG)/$(name).log"; \
+	fi
+
+restart: down up
+	@:
diff --git a/dev/README.md b/dev/README.md
new file mode 100644
index 000000000..906818ae6
--- /dev/null
+++ b/dev/README.md
@@ -0,0 +1,73 @@
+# dev/ — local debugging of seq-proxy + seq-db
+
+Runs two processes (seq-db `store` + seq-proxy `proxy`) locally for debugging in
+VS Code. A single `cmd/seq-db` binary runs in two modes — like
+`quickstart/docker-compose.yaml`, but locally.
+
+Controlled via `make` (targets are defined in `dev/Makefile`).
+
+Processes start as a **plain binary, without headless-delve**. Debugging is done
+through VS Code: the "Attach to Go process (pick)" config shows a list of
+Go processes; you pick store or proxy — under the hood it's `dlv attach <PID>`.
+
+## Ports
+
+| Process | HTTP | gRPC (clients) | gRPC (internal) | debug/pprof |
+|---------|------|----------------|-----------------|-------------|
+| seq-db store | :9102 | — | **:9104** | :9201 |
+| seq-proxy    | **:9002** | **:9004** | — | :9200 |
+
+Clients talk to the proxy: `http://localhost:9002` / `grpc://localhost:9004`.
+The proxy talks to the store at `localhost:9104`.
+
+## Running
+
+Commands can be run either from the `dev/` directory or from the repository root
+via `make -C dev …` (the `-C` flag points make at the directory with the
+`Makefile`):
+
+```bash
+make -C dev up        # build the debug binary and start store + proxy
+make -C dev status    # show process status and PIDs
+make -C dev logs      # tail both logs (or: make -C dev logs name=proxy)
+make -C dev down      # stop
+make -C dev restart   # down + up
+```
+
+Build only — `make -C dev build`.
+
+Debugging requires `dlv` installed (VS Code attaches through it):
+`go install github.com/go-delve/delve/cmd/dlv@latest`.
+
+## Debugging in VS Code
+
+1. `make -C dev up`
+2. Set breakpoints in the code you need (store: `storeapi/`, `frac/`, `storage/`; proxy: `proxy/`, `proxyapi/`).
+3. Run & Debug → **Attach to Go process (pick)**.
+4. Pick a process from the list: store and proxy are distinguishable by name —
+   `seq-db-store` and `seq-db-proxy` (the name is set via `exec -a`; it's one binary).
+
+To debug both processes at once — open a second VS Code window and attach to the
+other process.
+
+> Since the processes are started without headless-delve, you can attach to them
+> by PID without debugger conflicts (on macOS only one debugger can trace a
+> process at a time — a headless setup would block local-attach).
+
+## Files
+
+- `Makefile` — start/stop/logs/status targets (`up`, `down`, `status`, `logs`, `build`, `restart`)
+- `_helpers.sh` — shared bash functions for the Makefile recipes (paths via env)
+- `config.store.yaml` / `config.proxy.yaml` — local configs (ports are separated)
+- `data-store/` — store data (created automatically, safe to delete)
+- `logs/{store,proxy}.log` — process logs
+- `run/{store,proxy}.pid` — pid files
+
+## Notes
+
+- The binary is built with `-gcflags="all=-N -l"` (no optimizations/inlining) — required for the debugger.
+- The mapping is a local copy in `dev/mappings.yaml` (mirrors `quickstart/mappings.yaml`). Config paths are relative to the process CWD, which the `up` recipe sets to `dev/` — so `make -C dev up` works from anywhere.
+- The topology matches prod: proxy and store are separate processes. For simplified single-process debugging, the root `Makefile` has `make debug` (mode `single`).
+- The `Makefile` targets GNU Make 3.81 (macOS): bash function bodies live in
+  `_helpers.sh` and are loaded via `source`; the rest is written in recipes with
+  `; \`-continuations (`.ONESHELL` is unsupported in 3.81).
diff --git a/dev/_helpers.sh b/dev/_helpers.sh
new file mode 100644
index 000000000..455d8f5c7
--- /dev/null
+++ b/dev/_helpers.sh
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+#
+# dev/_helpers.sh — shared bash helpers for dev/Makefile.
+#
+# Not run on its own — only sourced from Makefile recipes. Reads paths from
+# environment variables exported by the Makefile:
+#   RUN — pid-file directory (dev/run)
+#   LOG — process log directory (dev/logs)
+#   BIN — path to the built debug binary
+#
+# Processes are started WITHOUT dlv — attach later via `dlv attach` from the IDE.
+# exec -a overrides argv[0] (process name): store/proxy are distinguishable in
+# `ps` and in the VS Code process list (one binary, different names).
+#
+
+set -euo pipefail
+
+log() { printf '\033[1;34m[dev]\033[0m %s\n' "$*"; }
+err() { printf '\033[1;31m[dev]\033[0m %s\n' "$*" >&2; }
+
+is_running() { [[ -f "$RUN/$1.pid" ]] && kill -0 "$(cat "$RUN/$1.pid")" 2>/dev/null; }
+
+start_one() {
+  local name="$1" cfg="$2" mode="$3"
+  if is_running "$name"; then
+    log "$name already running (pid $(cat "$RUN/$name.pid"))"
+    return 0
+  fi
+  log "starting $name (mode=$mode)"
+  mkdir -p "$RUN" "$LOG"
+  exec -a "seq-db-$name" "$BIN" --mode="$mode" --config="$cfg" >"$LOG/$name.log" 2>&1 &
+  echo $! >"$RUN/$name.pid"
+}
+
+wait_port() {
+  local port="$1" name="$2" i=0
+  while ! nc -z 127.0.0.1 "$port" 2>/dev/null; do
+    i=$((i+1))
+    if [[ $i -ge 60 ]]; then
+      err "$name did not open port :$port within 60s. See $LOG/$name.log"
+      tail -n 40 "$LOG/$name.log" >&2 || true
+      exit 1
+    fi
+    sleep 1
+  done
+}
+
+stop_one() {
+  local name="$1"
+  if is_running "$name"; then
+    local pid; pid="$(cat "$RUN/$name.pid")"
+    log "stopping $name (pid $pid)"
+    kill "$pid" 2>/dev/null || true
+    sleep 1
+    kill -9 "$pid" 2>/dev/null || true
+  fi
+  rm -f "$RUN/$name.pid"
+}
diff --git a/dev/config.proxy.yaml b/dev/config.proxy.yaml
new file mode 100644
index 000000000..dfd615497
--- /dev/null
+++ b/dev/config.proxy.yaml
@@ -0,0 +1,19 @@
+# Local debug config for seq-proxy.
+# Mode: --mode=proxy. Accepts HTTP/gRPC from clients, talks to store via gRPC.
+
+address:
+  http: :9002   # client HTTP API (gRPC-gateway)
+  grpc: :9004   # client gRPC API (SeqProxyApi)
+  debug: :9200  # pprof / debug server
+
+cluster:
+  hot_stores:
+    - localhost:9104
+
+slow_logs:
+  bulk_threshold: 1s
+  search_threshold: 100ms
+  fetch_threshold: 100ms
+
+mapping:
+  path: mappings.yaml
diff --git a/dev/config.store.yaml b/dev/config.store.yaml
new file mode 100644
index 000000000..af0eb5e93
--- /dev/null
+++ b/dev/config.store.yaml
@@ -0,0 +1,20 @@
+# Local debug config for seq-db (store).
+# Mode: --mode=store. Stores fractions, serves data to proxy via gRPC.
+
+address:
+  http: :9102   # not used in store, but occupies the port from config
+  grpc: :9104   # proxy connects here (cluster.hot_stores)
+  debug: :9201  # pprof / debug server
+
+storage:
+  data_dir: data-store
+  frac_size: 16MiB
+  total_size: 1GiB
+
+slow_logs:
+  bulk_threshold: 1s
+  search_threshold: 100ms
+  fetch_threshold: 100ms
+
+mapping:
+  path: mappings.yaml
diff --git a/dev/mappings.yaml b/dev/mappings.yaml
new file mode 100644
index 000000000..e8b74d7f4
--- /dev/null
+++ b/dev/mappings.yaml
@@ -0,0 +1,24 @@
+mapping-list:
+  - type: "keyword"
+    name: "k8s_pod"
+  - type: "keyword"
+    name: "k8s_namespace"
+  - type: "keyword"
+    name: "k8s_container"
+  - type: "text"
+    name: "request"
+  - type: "path"
+    name: "request_uri"
+  - name: "message"
+    types:
+      - type: "text"
+      - title: "keyword"
+        type: "keyword"
+        size: 18
+  - type: "object"
+    name: "someobj"
+    mapping-list:
+      - type: "keyword"
+        name: "nested"
+      - type:  "text"
+        name: "nestedtext"