diff --git a/infra/deploy/deploy-dev.sh b/infra/deploy/deploy-dev.sh
index 83de807..f4e3d70 100755
--- a/infra/deploy/deploy-dev.sh
+++ b/infra/deploy/deploy-dev.sh
@@ -2,7 +2,7 @@
 # LAN-dev deploy: roll the per-service registry-pull stack (see deploy.sh) onto
 # the ~/thermograph-dev overlay instead of prod/beta's loopback-only stack.
 #
-# This script assumes $APP_DIR is a checkout of THIS repo (thermograph-infra),
+# This script assumes $APP_DIR is a checkout of the monorepo (deploy assets under infra/),
 # the same way /opt/thermograph is on prod/beta. That is the live state: the LAN
 # box's ~/thermograph-dev was reprovisioned as an infra checkout during the
 # 2026-07-22 cutover (the app monorepo is archived), provision-dev-lan.sh's
@@ -44,6 +44,12 @@ export APP_DIR BRANCH
 # path-list separator it expects (';' only on Windows).
 export COMPOSE_FILE="docker-compose.yml:docker-compose.dev.yml"
 
+# Pin the dev project name: docker-compose.yml pins `name: thermograph` for
+# prod/beta, but dev's stack has always been the separate "thermograph-dev"
+# project (originally derived from this checkout's directory name). The env
+# var wins over the compose-file `name:` key, preserving that split.
+export COMPOSE_PROJECT_NAME="${COMPOSE_PROJECT_NAME:-thermograph-dev}"
+
 # deploy.sh needs POSTGRES_PASSWORD to interpolate the compose file (both to init
 # the db container and to build backend's THERMOGRAPH_DATABASE_URL) -- normally
 # supplied by /etc/thermograph.env via render-secrets.sh's SOPS render, but dev has
diff --git a/infra/deploy/deploy.sh b/infra/deploy/deploy.sh
index 192761b..b4a56ce 100755
--- a/infra/deploy/deploy.sh
+++ b/infra/deploy/deploy.sh
@@ -6,27 +6,30 @@
 # and you can run it by hand too.
 #
 #   # roll just the backend onto a specific image:
-#   ssh deploy@vps 'SERVICE=backend BACKEND_IMAGE_TAG=sha-<12hex> /opt/thermograph/deploy/deploy.sh'
+#   ssh deploy@vps 'SERVICE=backend BACKEND_IMAGE_TAG=sha-<12hex> /opt/thermograph/infra/deploy/deploy.sh'
 #   # roll just the frontend:
-#   ssh deploy@vps 'SERVICE=frontend FRONTEND_IMAGE_TAG=sha-<12hex> /opt/thermograph/deploy/deploy.sh'
+#   ssh deploy@vps 'SERVICE=frontend FRONTEND_IMAGE_TAG=sha-<12hex> /opt/thermograph/infra/deploy/deploy.sh'
 #   # bring the whole stack up (both tags required):
-#   ssh deploy@vps 'SERVICE=all BACKEND_IMAGE_TAG=sha-<a> FRONTEND_IMAGE_TAG=sha-<b> /opt/thermograph/deploy/deploy.sh'
+#   ssh deploy@vps 'SERVICE=all BACKEND_IMAGE_TAG=sha-<a> FRONTEND_IMAGE_TAG=sha-<b> /opt/thermograph/infra/deploy/deploy.sh'
 #
 # FE/BE CI-CD split: backend and frontend are published from separate repos as
-# separate images (emi/thermograph-backend/app, emi/thermograph-frontend/app),
+# separate images (emi/thermograph/backend, emi/thermograph/frontend),
 # so a deploy targets ONE service and leaves the other's running container +
 # tag untouched. Each service's live tag is persisted host-side in
 # deploy/.image-tags.env (untracked -- survives the git reset below) so a
 # single-service roll re-renders compose with BOTH services' real tags and
 # never accidentally recreates or downgrades the sibling.
 #
-# This checkout is thermograph-infra, not an app repo: BRANCH is this repo's
+# This checkout is the monorepo (compose + deploy live under infra/), not an app-only checkout: BRANCH is this repo's
 # branch (compose files, db init, the secrets vault, this script itself);
 # the *_IMAGE_TAG values are the separately-published app images to run -- the
 # two axes are independent and rarely change together.
 set -euo pipefail
 
 APP_DIR="${APP_DIR:-/opt/thermograph}"
+# Monorepo layout: git operations act on the checkout root ($APP_DIR); all
+# compose files and deploy assets live under infra/.
+INFRA_DIR="$APP_DIR/infra"
 BRANCH="${BRANCH:-main}"
 # Which service this deploy rolls: backend | frontend | all. Defaults to `all`
 # (a full-stack bring-up) so a by-hand run with both tags still works; the
@@ -49,7 +52,7 @@ esac
 # inherited across the self re-exec below, so the lock spans the whole run;
 # -w 600 bounds the wait (a deploy holding the lock >10 min is already
 # broken), after which this exits non-zero and the CI job fails loudly.
-DEPLOY_LOCK="$APP_DIR/deploy/.deploy.lock"
+DEPLOY_LOCK="$INFRA_DIR/deploy/.deploy.lock"
 if [ -z "${DEPLOY_SH_FLOCKED:-}" ]; then
   export DEPLOY_SH_FLOCKED=1
   exec flock -w 600 "$DEPLOY_LOCK" "$0" "$@"
@@ -66,10 +69,10 @@ fi
 # after which deploy.sh re-execs), so a missing helper simply falls back to the
 # existing /etc/thermograph.env. Then source it so a by-hand run interpolates the
 # same as the systemd unit does. See deploy/render-secrets.sh + deploy/secrets/.
-if [ -f "$APP_DIR/deploy/render-secrets.sh" ]; then
+if [ -f "$INFRA_DIR/deploy/render-secrets.sh" ]; then
   # shellcheck source=deploy/render-secrets.sh
-  . "$APP_DIR/deploy/render-secrets.sh"
-  render_thermograph_secrets "$APP_DIR"
+  . "$INFRA_DIR/deploy/render-secrets.sh"
+  render_thermograph_secrets "$INFRA_DIR"
 fi
 set -a; . /etc/thermograph.env 2>/dev/null || true; set +a
 
@@ -120,9 +123,15 @@ fi
 # freshly-pulled one, and the SERVICE/tag contract passes through unchanged --
 # the app repos' workflows never need to know which mode a host runs.
 if [ "$(cat /etc/thermograph/deploy-mode 2>/dev/null || true)" = "stack" ]; then
-  exec bash "$APP_DIR/deploy/stack/deploy-stack.sh"
+  exec bash "$INFRA_DIR/deploy/stack/deploy-stack.sh"
 fi
 
+# Monorepo: run every docker compose command from infra/ (the git operations
+# above ran at the checkout root). The compose project name is pinned in the
+# file itself (`name: thermograph`), so moving the working directory does NOT
+# rename the project and recreate the stack under a second name.
+cd "$INFRA_DIR"
+
 # Registry-pull cutover: pull the image each app repo's build-push.yml already
 # built and pushed, instead of building in place. This checkout is
 # thermograph-infra, not an app repo, so there's no "current commit" to derive
@@ -137,7 +146,7 @@ export REGISTRY_HOST BACKEND_IMAGE_PATH FRONTEND_IMAGE_PATH
 # bare `local` that would recreate/downgrade it). The incoming env for the
 # service being deployed then overrides its line below. This file is untracked
 # (see .gitignore), so `git reset --hard` above leaves it in place.
-TAGS_FILE="$APP_DIR/deploy/.image-tags.env"
+TAGS_FILE="$INFRA_DIR/deploy/.image-tags.env"
 # Capture the tags the caller explicitly passed BEFORE sourcing -- they must
 # WIN. The file only supplies the *sibling's* last-known tag; sourcing it
 # unconditionally would clobber an incoming tag (e.g. a frontend deploy whose
@@ -277,8 +286,8 @@ fi
 # roll never garbage-collects the image a rollback would need; docker also
 # refuses to remove an image any container still uses.
 echo "==> Pruning old app-image tags"
-_be_repo="${REGISTRY_HOST}/${BACKEND_IMAGE_PATH:-emi/thermograph-backend/app}"
-_fe_repo="${REGISTRY_HOST}/${FRONTEND_IMAGE_PATH:-emi/thermograph-frontend/app}"
+_be_repo="${REGISTRY_HOST}/${BACKEND_IMAGE_PATH:-emi/thermograph/backend}"
+_fe_repo="${REGISTRY_HOST}/${FRONTEND_IMAGE_PATH:-emi/thermograph/frontend}"
 docker images --format '{{.Repository}}:{{.Tag}}' \
   | grep -E "^(${_be_repo}|${_fe_repo}):" \
   | grep -v -e "^${_be_repo}:${BACKEND_IMAGE_TAG}$" -e "^${_fe_repo}:${FRONTEND_IMAGE_TAG}$" \
diff --git a/infra/deploy/stack/deploy-stack.sh b/infra/deploy/stack/deploy-stack.sh
index cdaa5a0..8833aec 100755
--- a/infra/deploy/stack/deploy-stack.sh
+++ b/infra/deploy/stack/deploy-stack.sh
@@ -48,10 +48,10 @@ export STACK_NAME
 # Render (SOPS) + source /etc/thermograph.env exactly like deploy.sh, then
 # install the uid-10001-readable copy the tasks' env-entrypoint shim sources.
 # 10001 = the app images' `thermograph` user; the file is 0400 to that uid.
-if [ -f "$APP_DIR/deploy/render-secrets.sh" ]; then
+if [ -f "$APP_DIR/infra/deploy/render-secrets.sh" ]; then
   # shellcheck source=deploy/render-secrets.sh
-  . "$APP_DIR/deploy/render-secrets.sh"
-  render_thermograph_secrets "$APP_DIR"
+  . "$APP_DIR/infra/deploy/render-secrets.sh"
+  render_thermograph_secrets "$APP_DIR/infra"
 fi
 set -a; . /etc/thermograph.env 2>/dev/null || true; set +a
 sudo install -o 10001 -g 0 -m 0400 /etc/thermograph.env /etc/thermograph/stack.env \
@@ -62,7 +62,7 @@ sudo install -o 10001 -g 0 -m 0400 /etc/thermograph.env /etc/thermograph/stack.e
 # supplies the sibling. Stack mode keeps its own file so test/real never mix.
 REGISTRY_HOST="${REGISTRY_HOST:-git.thermograph.org}"
 export REGISTRY_HOST
-TAGS_FILE="$APP_DIR/deploy/.stack-image-tags.env"
+TAGS_FILE="$APP_DIR/infra/deploy/.stack-image-tags.env"
 _incoming_backend="${BACKEND_IMAGE_TAG:-}"
 _incoming_frontend="${FRONTEND_IMAGE_TAG:-}"
 if [ -f "$TAGS_FILE" ]; then set -a; . "$TAGS_FILE"; set +a; fi
@@ -77,8 +77,8 @@ case "$SERVICE" in
 esac
 export BACKEND_IMAGE_TAG="${BACKEND_IMAGE_TAG:-local}"
 export FRONTEND_IMAGE_TAG="${FRONTEND_IMAGE_TAG:-local}"
-BACKEND_IMAGE="$REGISTRY_HOST/${BACKEND_IMAGE_PATH:-emi/thermograph-backend/app}:$BACKEND_IMAGE_TAG"
-FRONTEND_IMAGE="$REGISTRY_HOST/${FRONTEND_IMAGE_PATH:-emi/thermograph-frontend/app}:$FRONTEND_IMAGE_TAG"
+BACKEND_IMAGE="$REGISTRY_HOST/${BACKEND_IMAGE_PATH:-emi/thermograph/backend}:$BACKEND_IMAGE_TAG"
+FRONTEND_IMAGE="$REGISTRY_HOST/${FRONTEND_IMAGE_PATH:-emi/thermograph/frontend}:$FRONTEND_IMAGE_TAG"
 
 # --- timescale image pin ---------------------------------------------------------
 # Hazard #7: the db image under an existing volume must never drift. Resolve
@@ -138,7 +138,7 @@ FIRST_DEPLOY_MIGRATE=0
 docker service inspect "${STACK_NAME}_db" >/dev/null 2>&1 || FIRST_DEPLOY_MIGRATE=1
 if [ "$SERVICE" = "all" ] || ! docker service inspect "${STACK_NAME}_web" >/dev/null 2>&1; then
   echo "==> docker stack deploy ($STACK_NAME)"
-  docker stack deploy --with-registry-auth -c "$APP_DIR/deploy/stack/thermograph-stack.yml" "$STACK_NAME"
+  docker stack deploy --with-registry-auth -c "$APP_DIR/infra/deploy/stack/thermograph-stack.yml" "$STACK_NAME"
   # First-ever deploy ran no migrate above (db didn't exist): wait for db,
   # migrate, then force web/worker to restart cleanly against the schema.
   if [ "${FIRST_DEPLOY_MIGRATE:-0}" = "1" ]; then
@@ -179,7 +179,7 @@ if ! docker ps --format '{{.Names}}' | grep -qx "$LB_NAME"; then
   docker run -d --name "$LB_NAME" --restart unless-stopped \
     --network "$NET" \
     -p "127.0.0.1:${LB_HTTP_PORT}:8137" -p "127.0.0.1:${LB_FE_PORT}:8080" \
-    -v "$APP_DIR/deploy/stack/lb/Caddyfile:/etc/caddy/Caddyfile:ro" \
+    -v "$APP_DIR/infra/deploy/stack/lb/Caddyfile:/etc/caddy/Caddyfile:ro" \
     caddy:2-alpine >/dev/null
 fi
 
@@ -205,8 +205,8 @@ FRONTEND_IMAGE_TAG=$FRONTEND_IMAGE_TAG
 EOF
 
 # GC superseded app-image tags (keep the running pair), same as deploy.sh.
-_be_repo="$REGISTRY_HOST/${BACKEND_IMAGE_PATH:-emi/thermograph-backend/app}"
-_fe_repo="$REGISTRY_HOST/${FRONTEND_IMAGE_PATH:-emi/thermograph-frontend/app}"
+_be_repo="$REGISTRY_HOST/${BACKEND_IMAGE_PATH:-emi/thermograph/backend}"
+_fe_repo="$REGISTRY_HOST/${FRONTEND_IMAGE_PATH:-emi/thermograph/frontend}"
 docker images --format '{{.Repository}}:{{.Tag}}' \
   | grep -E "^(${_be_repo}|${_fe_repo}):" \
   | grep -v -e "^${_be_repo}:${BACKEND_IMAGE_TAG}$" -e "^${_fe_repo}:${FRONTEND_IMAGE_TAG}$" \
diff --git a/infra/deploy/stack/thermograph-stack.yml b/infra/deploy/stack/thermograph-stack.yml
index a3b7c22..c8bdd51 100644
--- a/infra/deploy/stack/thermograph-stack.yml
+++ b/infra/deploy/stack/thermograph-stack.yml
@@ -64,7 +64,7 @@ services:
         condition: on-failure
 
   web:
-    image: ${REGISTRY_HOST:-git.thermograph.org}/${BACKEND_IMAGE_PATH:-emi/thermograph-backend/app}:${BACKEND_IMAGE_TAG:?required}
+    image: ${REGISTRY_HOST:-git.thermograph.org}/${BACKEND_IMAGE_PATH:-emi/thermograph/backend}:${BACKEND_IMAGE_TAG:?required}
     entrypoint: ["/host/env-entrypoint.sh"]
     environment:
       THERMOGRAPH_DATABASE_URL: postgresql+asyncpg://thermograph:${POSTGRES_PASSWORD}@db:5432/thermograph
@@ -105,7 +105,7 @@ services:
         failure_action: rollback
 
   worker:
-    image: ${REGISTRY_HOST:-git.thermograph.org}/${BACKEND_IMAGE_PATH:-emi/thermograph-backend/app}:${BACKEND_IMAGE_TAG:?required}
+    image: ${REGISTRY_HOST:-git.thermograph.org}/${BACKEND_IMAGE_PATH:-emi/thermograph/backend}:${BACKEND_IMAGE_TAG:?required}
     entrypoint: ["/host/env-entrypoint.sh"]
     environment:
       THERMOGRAPH_DATABASE_URL: postgresql+asyncpg://thermograph:${POSTGRES_PASSWORD}@db:5432/thermograph
@@ -139,7 +139,7 @@ services:
         condition: on-failure
 
   frontend:
-    image: ${REGISTRY_HOST:-git.thermograph.org}/${FRONTEND_IMAGE_PATH:-emi/thermograph-frontend/app}:${FRONTEND_IMAGE_TAG:?required}
+    image: ${REGISTRY_HOST:-git.thermograph.org}/${FRONTEND_IMAGE_PATH:-emi/thermograph/frontend}:${FRONTEND_IMAGE_TAG:?required}
     entrypoint: ["/host/env-entrypoint.sh"]
     environment:
       THERMOGRAPH_BASE: /
diff --git a/infra/docker-compose.yml b/infra/docker-compose.yml
index c866273..4de4659 100644
--- a/infra/docker-compose.yml
+++ b/infra/docker-compose.yml
@@ -25,6 +25,13 @@
 # so `docker compose up` can interpolate it. It is used BOTH to initialize the db
 # container and to build backend's THERMOGRAPH_DATABASE_URL below.
 
+# Pin the compose project name: the monorepo layout runs compose from
+# /opt/thermograph/infra, and without an explicit name the project would be
+# derived from that directory ("infra") -- silently a NEW project, recreating
+# the whole stack beside the running one. LAN dev overrides this via
+# COMPOSE_PROJECT_NAME=thermograph-dev (the env var always wins over this key).
+name: thermograph
+
 services:
   db:
     # TimescaleDB on PostgreSQL 18 (the stock image already sets
@@ -90,10 +97,10 @@ services:
     # No `build:` here -- infra holds no Dockerfile; each service's Dockerfile
     # lives in its own app repo. deploy.sh sets BACKEND_IMAGE_TAG to the SHA
     # build-push.yml pushed for the backend commit being deployed; local dev
-    # builds `emi/thermograph-backend/app:local` from the backend repo (see
+    # builds `emi/thermograph/backend:local` from the backend repo (see
     # infra Makefile) and this pulls/uses it. BACKEND_IMAGE_PATH/TAG are
     # independent of the frontend's, so the two services deploy separately.
-    image: ${REGISTRY_HOST:-git.thermograph.org}/${BACKEND_IMAGE_PATH:-emi/thermograph-backend/app}:${BACKEND_IMAGE_TAG:-local}
+    image: ${REGISTRY_HOST:-git.thermograph.org}/${BACKEND_IMAGE_PATH:-emi/thermograph/backend}:${BACKEND_IMAGE_TAG:-local}
     depends_on:
       db:
         condition: service_healthy
@@ -155,7 +162,7 @@ services:
     # from its own Dockerfile (which starts `uvicorn app:app` directly -- no
     # THERMOGRAPH_SERVICE_ROLE process-picking anymore). Independent
     # FRONTEND_IMAGE_TAG so a frontend deploy never disturbs the backend's tag.
-    image: ${REGISTRY_HOST:-git.thermograph.org}/${FRONTEND_IMAGE_PATH:-emi/thermograph-frontend/app}:${FRONTEND_IMAGE_TAG:-local}
+    image: ${REGISTRY_HOST:-git.thermograph.org}/${FRONTEND_IMAGE_PATH:-emi/thermograph/frontend}:${FRONTEND_IMAGE_TAG:-local}
     # Its own register() fetches the IndexNow key from backend at boot -- must
     # wait for a real, healthy backend, not just a started container.
     depends_on: