diff --git a/config/loader.py b/config/loader.py
index 4977729..f542a52 100644
--- a/config/loader.py
+++ b/config/loader.py
@@ -24,24 +24,43 @@ CONFIG_DIR = Path(os.environ.get("CONFIG_DIR", "./config"))
 _ENV_PATTERN = re.compile(r"\$\{([^}]+)\}")
 
 
-def _resolve_env_refs(value: Any) -> Any:
+def _resolve_env_refs(value: Any, _path: str = "") -> Any:
     """Resolve ${ENV_VAR} references in config values.
 
     Walks the config tree recursively. String values containing ${VAR}
-    are replaced with the corresponding environment variable value
-    (empty string if not set). Non-string values pass through unchanged.
+    are replaced with the corresponding environment variable value.
+    Logs a warning for unset variables so misconfiguration is visible.
+    Non-string values pass through unchanged.
     """
     if isinstance(value, str):
+        missing_vars: list[str] = []
 
         def replacer(match: re.Match) -> str:
             env_key = match.group(1)
-            return os.environ.get(env_key, "")
+            env_val = os.environ.get(env_key)
+            if env_val is None:
+                missing_vars.append(env_key)
+                return ""
+            return env_val
 
-        return _ENV_PATTERN.sub(replacer, value)
+        resolved = _ENV_PATTERN.sub(replacer, value)
+        for var in missing_vars:
+            logger.warning(
+                "Environment variable %s not set (referenced in config %s)",
+                var,
+                _path or "value",
+            )
+        return resolved
     if isinstance(value, dict):
-        return {k: _resolve_env_refs(v) for k, v in value.items()}
+        return {
+            k: _resolve_env_refs(v, _path=f"{_path}.{k}" if _path else k)
+            for k, v in value.items()
+        }
     if isinstance(value, list):
-        return [_resolve_env_refs(item) for item in value]
+        return [
+            _resolve_env_refs(item, _path=f"{_path}[{i}]")
+            for i, item in enumerate(value)
+        ]
     return value
 
 
@@ -94,8 +113,13 @@ def _validate_config(config: dict) -> None:
         ("server", "hostname"),
     ]
 
+    # Secret fields that must resolve to non-empty values (from .env)
+    required_secrets = [
+        ("auth", "webapp_secret_key"),
+    ]
+
     missing = []
-    for keys in required_paths:
+    for keys in required_paths + required_secrets:
         value = config
         path_str = ".".join(keys)
         for key in keys:
@@ -110,7 +134,7 @@ def _validate_config(config: dict) -> None:
     if missing:
         raise ValueError(
             f"Missing required instance config fields: {', '.join(missing)}. "
-            f"Check config/instance.yaml"
+            f"Check config/instance.yaml and .env"
         )
 
 
diff --git a/dev_docs/desktop-app.md b/dev_docs/desktop-app.md
index f14b813..6802b67 100644
--- a/dev_docs/desktop-app.md
+++ b/dev_docs/desktop-app.md
@@ -65,7 +65,7 @@ Server: `wss://your-instance.example.com/ws/notifications`
 
 ```
 Client -> Server: {"type":"auth","token":"eyJ..."}
-Server -> Client: {"type":"auth_ok","username":"petr"}
+Server -> Client: {"type":"auth_ok","username":"john"}
 Server -> Client: {"type":"notification","id":"uuid","title":"Revenue Drop","message":"...","image_url":"/api/notifications/images/abc.png","script":"revenue_check","timestamp":"2026-01-30T10:00:00Z"}
 Server -> Client: {"type":"ping"}
 Client -> Server: {"type":"pong"}
diff --git a/dev_docs/disaster-recovery.md b/dev_docs/disaster-recovery.md
index 232706f..dbcd7f0 100644
--- a/dev_docs/disaster-recovery.md
+++ b/dev_docs/disaster-recovery.md
@@ -1,6 +1,6 @@
 # Disaster Recovery
 
-Recovery procedures for the Data Broker Server (`data-broker-for-claude`).
+Recovery procedures for the Data Broker Server (`your-server`).
 
 ## Overview
 
@@ -40,8 +40,8 @@ Disk Layout:
 1. **Create new VM** (same zone, attach existing disks):
    ```bash
    # Create new instance with existing disks
-   gcloud compute instances create data-broker-for-claude \
-     --project=kids-ai-data-analysis \
+   gcloud compute instances create your-server \
+     --project=your-gcp-project \
      --zone=europe-north1-a \
      --machine-type=e2-medium \
      --image-family=debian-12 \
@@ -50,13 +50,13 @@ Disk Layout:
      --tags=http-server,https-server
 
    # Attach existing data disks
-   gcloud compute instances attach-disk data-broker-for-claude \
-     --project=kids-ai-data-analysis \
+   gcloud compute instances attach-disk your-server \
+     --project=your-gcp-project \
      --zone=europe-north1-a \
      --disk=data-disk
 
-   gcloud compute instances attach-disk data-broker-for-claude \
-     --project=kids-ai-data-analysis \
+   gcloud compute instances attach-disk your-server \
+     --project=your-gcp-project \
      --zone=europe-north1-a \
      --disk=home-disk
    ```
@@ -159,19 +159,19 @@ Disk Layout:
 
 ```bash
 # Find latest snapshot
-gcloud compute snapshots list --project=kids-ai-data-analysis \
+gcloud compute snapshots list --project=your-gcp-project \
   --filter="sourceDisk:data-disk" --sort-by=~creationTimestamp --limit=5
 
 # Create new disk from snapshot
 gcloud compute disks create data-disk \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --zone=europe-north1-a \
   --source-snapshot=SNAPSHOT_NAME \
   --type=pd-balanced
 
 # Attach to VM (may need to stop VM first)
-gcloud compute instances attach-disk data-broker-for-claude \
-  --project=kids-ai-data-analysis \
+gcloud compute instances attach-disk your-server \
+  --project=your-gcp-project \
   --zone=europe-north1-a \
   --disk=data-disk
 
@@ -184,7 +184,7 @@ ssh kids "sudo mount /dev/sdb /data"
 ```bash
 # Create fresh disk
 gcloud compute disks create data-disk \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --zone=europe-north1-a \
   --size=30GB \
   --type=pd-balanced
@@ -209,19 +209,19 @@ ssh kids "cd /opt/data-analyst/repo && ./scripts/update.sh"
 
 ```bash
 # Find latest snapshot
-gcloud compute snapshots list --project=kids-ai-data-analysis \
+gcloud compute snapshots list --project=your-gcp-project \
   --filter="sourceDisk:home-disk" --sort-by=~creationTimestamp --limit=5
 
 # Create new disk from snapshot
 gcloud compute disks create home-disk \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --zone=europe-north1-a \
   --source-snapshot=SNAPSHOT_NAME \
   --type=pd-balanced
 
 # Attach to VM
-gcloud compute instances attach-disk data-broker-for-claude \
-  --project=kids-ai-data-analysis \
+gcloud compute instances attach-disk your-server \
+  --project=your-gcp-project \
   --zone=europe-north1-a \
   --disk=home-disk
 
diff --git a/dev_docs/draft/services-integration-claude.md b/dev_docs/draft/services-integration-claude.md
index 366dfb0..6585ec1 100644
--- a/dev_docs/draft/services-integration-claude.md
+++ b/dev_docs/draft/services-integration-claude.md
@@ -96,7 +96,7 @@ def _get_server_username(webapp_username) -> str               # Reuse WEBAPP_TO
 Storage format (`connections.json`):
 ```json
 {
-  "petr": {
+  "john": {
     "purchase_orders": {
       "connected": true,
       "api_key": "pk_live_abc123...",
@@ -126,7 +126,7 @@ What each external service needs to implement:
 ```
 POST /api/internal/token-exchange
 Authorization: Bearer <shared_secret>
-Body: {"user_email": "petr@your-domain.com", "ttl_days": 90}
+Body: {"user_email": "john@your-domain.com", "ttl_days": 90}
 Response: {"status": "ok", "api_key": "...", "token_id": "...", "expires_at": "..."}
 
 POST /api/internal/token-revoke
diff --git a/dev_docs/draft/services-integration.md b/dev_docs/draft/services-integration.md
index b2f6704..6691bb7 100644
--- a/dev_docs/draft/services-integration.md
+++ b/dev_docs/draft/services-integration.md
@@ -117,7 +117,7 @@ SKILLS_DIR = Path(os.environ.get("SC_SKILLS_DIR", "/data/docs/service_connector_
 # Username mapping (reuse existing pattern)
 WEBAPP_TO_SERVER_USERNAME = {
     # Add overrides here if webapp username != server username
-    # "dasa.damaskova": "dasa",
+    # "jane.smith": "jane",
 }
 
 
@@ -503,7 +503,7 @@ What each internal service needs to implement (simple Bearer + JSON):
 POST /api/internal/token-exchange
 Authorization: Bearer <shared_secret>
 Content-Type: application/json
-Body: {"user_email": "petr@your-domain.com", "ttl_days": 365}
+Body: {"user_email": "john@your-domain.com", "ttl_days": 365}
 Response: {"status": "ok", "api_key": "...", "token_id": "...", "expires_at": "..."}
 
 POST /api/internal/token-revoke
diff --git a/dev_docs/plan-rsync-fix.md b/dev_docs/plan-rsync-fix.md
index 8078342..7f37e3b 100644
--- a/dev_docs/plan-rsync-fix.md
+++ b/dev_docs/plan-rsync-fix.md
@@ -2,7 +2,7 @@
 
 ## Problem
 
-Rsync from GCP server (34.88.8.46) hangs after 1-5 minutes. Process exists but has 0% CPU and no network activity. 100% reproducible with ~7000 parquet files.
+Rsync from GCP server (YOUR_SERVER_IP) hangs after 1-5 minutes. Process exists but has 0% CPU and no network activity. 100% reproducible with ~7000 parquet files.
 
 ## Root Cause Analysis
 
diff --git a/dev_docs/security.md b/dev_docs/security.md
index 2208bf0..2ec35f4 100644
--- a/dev_docs/security.md
+++ b/dev_docs/security.md
@@ -1,7 +1,7 @@
 # Security Audit Report: Data Broker Server
 
 **Date:** 2026-01-30
-**Server:** `data-broker-for-claude` (YOUR_SERVER_IP), Debian 12 (bookworm), GCP e2-medium
+**Server:** `your-server` (YOUR_SERVER_IP), Debian 12 (bookworm), GCP e2-medium
 **Auditors:** Claude Opus 4.5 (primary) + Perplexity Sonar (validation) + OpenAI Codex (second opinion)
 **Scope:** Linux server security, user isolation, CI/CD pipeline, notification system, desktop app attack surface
 **Status:** Read-only audit -- no changes were made to the server
@@ -44,8 +44,8 @@ These findings were independently validated by Perplexity (CVE references, Unix
 
 | Parameter | Value |
 |-----------|-------|
-| Hostname | data-broker-for-claude |
-| GCP Project | kids-ai-data-analysis |
+| Hostname | your-server |
+| GCP Project | your-gcp-project |
 | Zone | europe-north1-a |
 | OS | Debian 12 (bookworm) |
 | External IP | YOUR_SERVER_IP |
@@ -55,9 +55,9 @@ These findings were independently validated by Perplexity (CVE references, Unix
 
 | Group | Members | Purpose |
 |-------|---------|---------|
-| `dataread` | padak, matejkys, dasa, petr, fisa, dasa.damaskova, martin.lepka, pavel.dolezal, martin.matejka, jiri.manas | Public data read access |
-| `data-private` | padak, matejkys, dasa | Private/sensitive data access |
-| `data-ops` | deploy, padak, matejkys, dasa, www-data | Application deployment and operations |
+| `dataread` | admin1, admin2, admin3, john, analyst1, jane.smith, bob.jones, alice.wilson, mike.brown, tom.davis | Public data read access |
+| `data-private` | admin1, admin2, admin3 | Private/sensitive data access |
+| `data-ops` | deploy, admin1, admin2, admin3, www-data | Application deployment and operations |
 
 ### Services
 
@@ -203,7 +203,7 @@ Source: SentinelOne vulnerability database, Compass Security research on dangero
 
 #### Description
 
-The directory `/data/src_data/parquet/private/` is intended to be accessible only to members of the `data-private` group (3 privileged users: padak, matejkys, dasa). However, its POSIX ACL also grants access to the `dataread` group, which contains **all 10 analysts**:
+The directory `/data/src_data/parquet/private/` is intended to be accessible only to members of the `data-private` group (3 privileged users: admin1, admin2, admin3). However, its POSIX ACL also grants access to the `dataread` group, which contains **all 10 analysts**:
 
 ```
 # getfacl /data/src_data/parquet/private/
@@ -224,13 +224,13 @@ The POSIX ACL mask (`mask::rwx`) does not restrict the `dataread` entry because
 
 #### Proof of Exploitation
 
-Tested directly on server with user `fisa` (standard analyst, member of `dataread` only, NOT `data-private`):
+Tested directly on server with user `analyst1` (standard analyst, member of `dataread` only, NOT `data-private`):
 
 ```bash
-$ sudo -u fisa ls -la /data/src_data/parquet/private/
+$ sudo -u analyst1 ls -la /data/src_data/parquet/private/
 total 16
-drwxrws---+ 2 padak data-ops 4096 Jan 21 14:29 .
-drwxrws---+ 7 padak data-ops 4096 Jan 23 18:29 ..
+drwxrws---+ 2 admin1 data-ops 4096 Jan 21 14:29 .
+drwxrws---+ 7 admin1 data-ops 4096 Jan 23 18:29 ..
 # Exit code: 0 (access granted)
 ```
 
@@ -265,7 +265,7 @@ sudo setfacl -R -m u::rwx,g::rwx,g:data-private:r-x,g:data-ops:rwx,o::--- /data/
 sudo setfacl -R -d -m u::rwx,g::rwx,g:data-private:r-x,g:data-ops:rwx,o::--- /data/src_data/parquet/private/
 
 # Verify:
-sudo -u fisa ls /data/src_data/parquet/private/
+sudo -u analyst1 ls /data/src_data/parquet/private/
 # Expected: "ls: cannot open directory 'private/': Permission denied"
 ```
 
@@ -461,7 +461,7 @@ The server may be reachable on port 25 from the internet, potentially allowing:
 
 ```
 # /etc/postfix/main.cf
-myhostname = data-broker-for-claude.c.kids-ai-data-analysis.internal
+myhostname = your-server.c.your-gcp-project.internal
 mydestination = $myhostname, localhost
 inet_interfaces = all
 
@@ -751,14 +751,14 @@ The following findings were identified by the OpenAI Codex second opinion review
    - `webapp/desktop_auth.py`, `webapp/user_service.py` (auth flows)
    - `.github/workflows/deploy.yml` (CI/CD configuration)
 
-2. **Live server inspection** (read-only, via SSH as padak):
+2. **Live server inspection** (read-only, via SSH as admin1):
    - File permissions: `ls -la`, `stat`, `getfacl` on all critical paths
    - Socket permissions: `/run/notify-bot/`, `/run/ws-gateway/`
    - Group memberships: `getent group` for dataread, data-private, data-ops
    - Service status: `systemctl list-units`
    - Network: `ss -tlnp`, iptables, SSH config, nginx config
    - Crontabs: all users checked
-   - Access control test: `sudo -u fisa ls` on private directory
+   - Access control test: `sudo -u analyst1 ls` on private directory
 
 3. **Validation**: Perplexity Sonar search for CVE references and best practices on:
    - Unix socket 0666 security (dirty_sock CVE-2019-7304)
diff --git a/dev_docs/server.md b/dev_docs/server.md
index fb9a68b..3035a5e 100644
--- a/dev_docs/server.md
+++ b/dev_docs/server.md
@@ -6,8 +6,8 @@ Central server for distributing data to AI analytical systems.
 
 | Parameter | Value |
 |-----------|-------|
-| Name | data-broker-for-claude |
-| GCP Project | kids-ai-data-analysis |
+| Name | your-server |
+| GCP Project | your-gcp-project |
 | Zone | europe-north1-a |
 | Type | e2-medium |
 | OS | Debian 12 (bookworm) |
@@ -36,13 +36,13 @@ Requires SSH config:
 ```
 Host kids
   HostName YOUR_SERVER_IP
-  User padak
+  User admin1
   IdentityFile ~/.ssh/google_compute_engine
 ```
 
 Or via gcloud:
 ```bash
-gcloud compute ssh data-broker-for-claude --project=kids-ai-data-analysis --zone=europe-north1-a
+gcloud compute ssh your-server --project=your-gcp-project --zone=europe-north1-a
 ```
 
 ## Data Structure
@@ -62,7 +62,7 @@ gcloud compute ssh data-broker-for-claude --project=kids-ai-data-analysis --zone
 ├── docs/                   # Documentation (deployed from repo)
 │   └── schema.yml          # Auto-generated table schemas (from data sync)
 ├── scripts/                # Helper scripts (deployed from repo)
-├── examples/               # Example notification scripts (padak:data-ops, 755)
+├── examples/               # Example notification scripts (admin1:data-ops, 755)
 │   └── notifications/      # Example notification scripts for analysts
 ├── notifications/          # Notification data (deploy:data-ops, 2770 setgid)
 │   ├── telegram_users.json # username -> {chat_id, linked_at} mapping
@@ -116,7 +116,7 @@ Three-tier permission model:
 Data in `/data/src_data/` uses ACL for granular access:
 
 ```
-/data/src_data/          owner: padak, group: data-ops
+/data/src_data/          owner: admin1, group: data-ops
 ├── raw/                 data-ops: rwx, dataread: r-x
 ├── parquet/             data-ops: rwx, dataread: r-x
 │   └── private/         data-ops: rwx, data-private: r-x
@@ -211,20 +211,20 @@ sudo add-analyst novak "ssh-rsa AAAAB3... jan.novak@example.com"
 sudo add-analyst ceo "ssh-rsa AAAAB3... ceo@example.com" --private
 
 # Server administrator
-sudo add-admin matejkys "ssh-rsa AAAAB3... matejkys@example.com"
-sudo add-admin dasa "ssh-ed25519 AAAAC3... dasa@your-domain.com"
+sudo add-admin admin2 "ssh-rsa AAAAB3... admin2@example.com"
+sudo add-admin admin3 "ssh-ed25519 AAAAC3... admin3@your-domain.com"
 ```
 
 Output for admin:
 ```
-Admin matejkys created successfully
+Admin admin2 created successfully
   - Added to group: sudo (server administration)
   - Added to group: dataread (public data access)
   - Added to group: data-private (private data access)
   - Added to group: data-ops (application deployment)
   - Added to resource limits (unlimited)
-  - Workspace: /home/matejkys/workspace
-  - Data link: /home/matejkys/data -> /data/src_data
+  - Workspace: /home/admin2/workspace
+  - Data link: /home/admin2/data -> /data/src_data
 ```
 
 ## SSH Configuration
@@ -531,7 +531,7 @@ ssh kids "du -sh /data/*"
 
 | Disk | Mount | Size | Purpose | Backup |
 |------|-------|------|---------|--------|
-| `data-broker-for-claude` (sda) | `/` | 10 GB | OS, packages, app | Expendable (rebuild from git) |
+| `your-server` (sda) | `/` | 10 GB | OS, packages, app | Expendable (rebuild from git) |
 | `data-disk` (sdb) | `/data` | 30 GB | Parquet data, docs, scripts | Daily GCP snapshots |
 | `home-disk` (sdc) | `/home` | 30 GB | User homes, SSH keys, workspaces | Daily GCP snapshots |
 | `tmp-disk` (sdd) | `/tmp` | 100 GB | Temporary files | Expendable (not snapshotted) |
@@ -543,14 +543,14 @@ Both `data-disk` and `home-disk` have daily GCP snapshot schedules with 14-day r
 ```bash
 # Check snapshot schedule status
 gcloud compute resource-policies describe daily-backup \
-  --project=kids-ai-data-analysis --region=europe-north1
+  --project=your-gcp-project --region=europe-north1
 
 # List existing snapshots
-gcloud compute snapshots list --project=kids-ai-data-analysis
+gcloud compute snapshots list --project=your-gcp-project
 
 # Manual snapshot (if needed)
 gcloud compute disks snapshot data-disk home-disk \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --zone=europe-north1-a \
   --snapshot-names=data-disk-$(date +%Y%m%d),home-disk-$(date +%Y%m%d)
 ```
@@ -696,9 +696,9 @@ sudo /opt/data-analyst/repo/server/setup.sh
 
 **5. Add existing admins to data-ops group:**
 ```bash
-sudo usermod -aG data-ops padak
-sudo usermod -aG data-ops matejkys
-sudo usermod -aG data-ops dasa
+sudo usermod -aG data-ops admin1
+sudo usermod -aG data-ops admin2
+sudo usermod -aG data-ops admin3
 ```
 
 ### GitHub Secrets Required
@@ -918,7 +918,7 @@ This is handled in `webapp/user_service.py` and `server/telegram_bot/runner.py`.
 Username is generated from email address: the part before `@` converted to lowercase.
 
 Examples:
-- `Petr.Simecek@your-domain.com` -> `petr.simecek`
+- `John.Doe@your-domain.com` -> `john.doe`
 - `john@your-domain.com` -> `john`
 
 If a username conflicts with a reserved system name or existing non-analyst account, the user sees an error and must contact an admin to create the account manually with a different username.
@@ -929,7 +929,7 @@ If a username conflicts with a reserved system name or existing non-analyst acco
 ```bash
 # Allow HTTP/HTTPS traffic (required for Let's Encrypt and webapp)
 gcloud compute firewall-rules create allow-http-data-broker \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --direction=INGRESS \
   --priority=1000 \
   --network=default \
@@ -939,8 +939,8 @@ gcloud compute firewall-rules create allow-http-data-broker \
   --target-tags=http-server,https-server
 
 # Add tags to VM
-gcloud compute instances add-tags data-broker-for-claude \
-  --project=kids-ai-data-analysis \
+gcloud compute instances add-tags your-server \
+  --project=your-gcp-project \
   --zone=europe-north1-a \
   --tags=http-server,https-server
 ```
@@ -1192,7 +1192,7 @@ Users can configure which optional datasets to sync via the web portal at `https
 **sync_settings.json format:**
 ```json
 {
-  "petr.simecek": {
+  "john.doe": {
     "datasets": {
       "jira": true,
       "jira_attachments": false
@@ -1524,7 +1524,7 @@ Cron (update.sh, 3x daily)
   Step 3: python -m src.profiler      → profiles.json
                 │
                 ▼
-/data/src_data/metadata/profiles.json  (mode 644, padak:data-ops)
+/data/src_data/metadata/profiles.json  (mode 644, admin1:data-ops)
                 │
                 ▼
 Webapp: GET /api/catalog/profile/<table_name>
@@ -1756,23 +1756,23 @@ The webapp runs as `www-data` which cannot write to `/home/{user}/` directories
 
 ### Username Mapping
 
-The webapp uses email-derived usernames (e.g., `petr.simecek`) while the server uses Linux home directory names (e.g., `petr`). Most users match, only Petr differs.
+The webapp uses email-derived usernames (e.g., `john.doe`) while the server uses Linux home directory names (e.g., `john`). Most users match directly; add overrides when they differ.
 
 Mapping is in `webapp/corporate_memory_service.py`:
 ```python
 WEBAPP_TO_SERVER_USERNAME = {
-    "petr.simecek": "petr",
+    "john.doe": "john",
 }
 ```
 
 Display names for avatars (initials + tooltip):
 ```python
 USER_DISPLAY_NAMES = {
-    "petr": {"name": "Petr Simecek", "initials": "PS"},
-    "dasa.damaskova": {"name": "Dasa Damaskova", "initials": "DD"},
-    "martin.matejka": {"name": "Martin Matejka", "initials": "MM"},
-    "jiri.manas": {"name": "Jiri Manas", "initials": "JM"},
-    "pavel.dolezal": {"name": "Pavel Dolezal", "initials": "PD"},
+    "john": {"name": "John Doe", "initials": "JD"},
+    "jane.smith": {"name": "Jane Smith", "initials": "DD"},
+    "mike.brown": {"name": "Mike Brown", "initials": "MM"},
+    "tom.davis": {"name": "Tom Davis", "initials": "JM"},
+    "alice.wilson": {"name": "Alice Wilson", "initials": "PD"},
 }
 ```
 
@@ -1802,7 +1802,7 @@ USER_DISPLAY_NAMES = {
       "content": "Always read schema before queries...",
       "category": "workflow",
       "tags": ["duckdb", "best-practices"],
-      "source_users": ["petr"],
+      "source_users": ["john"],
       "extracted_at": "2026-02-05T21:54:18Z",
       "updated_at": "2026-02-05T21:54:18Z"
     }
@@ -1817,7 +1817,7 @@ USER_DISPLAY_NAMES = {
 **votes.json structure:**
 ```json
 {
-  "petr": {
+  "john": {
     "km_abc123": 1,
     "km_def456": -1
   }
@@ -1940,7 +1940,7 @@ cat /data/corporate-memory/votes.json | python3 -m json.tool
 cat /data/corporate-memory/user_hashes.json | python3 -m json.tool
 
 # View a user's synced rules
-ls -la /home/petr/.claude_rules/
+ls -la /home/john/.claude_rules/
 ```
 
 ### Webapp Integration
@@ -2092,7 +2092,7 @@ Custom metrics derived from logs for trend analysis:
 - Real-time CPU, Memory, Disk, Network graphs
 - Systemd service failures
 - Health endpoint status
-- URL: https://console.cloud.google.com/monitoring/dashboards/custom/09cdd94b-a0ed-4458-952f-3cca2bd5ba6e?project=kids-ai-data-analysis
+- URL: https://console.cloud.google.com/monitoring/dashboards/custom/09cdd94b-a0ed-4458-952f-3cca2bd5ba6e?project=your-gcp-project
 
 ### Health Endpoint & Uptime Monitoring
 
@@ -2135,7 +2135,7 @@ Returns detailed server status in JSON format:
 ### Viewing Logs
 
 **Cloud Logging Console:**
-https://console.cloud.google.com/logs?project=kids-ai-data-analysis
+https://console.cloud.google.com/logs?project=your-gcp-project
 
 **Useful log queries:**
 
@@ -2168,7 +2168,7 @@ resource.labels.instance_id="656c1763-11a1-49bb-bbc3-9782acf15aef"
 ### Viewing Metrics
 
 **Cloud Monitoring Console:**
-https://console.cloud.google.com/monitoring?project=kids-ai-data-analysis
+https://console.cloud.google.com/monitoring?project=your-gcp-project
 
 **Metrics Explorer** - Useful metric queries:
 - CPU: `compute.googleapis.com/instance/cpu/utilization`
@@ -2191,21 +2191,21 @@ Significantly cheaper than Datadog (~$15-31/host/month).
 **List alert policies:**
 ```bash
 gcloud alpha monitoring policies list \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --format="table(displayName,enabled,conditions[0].conditionThreshold.thresholdValue)"
 ```
 
 **Disable an alert:**
 ```bash
 gcloud alpha monitoring policies update POLICY_ID \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --no-enabled
 ```
 
 **Add notification channel:**
 ```bash
 gcloud alpha monitoring channels create \
-  --project=kids-ai-data-analysis \
+  --project=your-gcp-project \
   --display-name="New Person" \
   --type=email \
   --channel-labels=email_address=person@your-domain.com
@@ -2234,7 +2234,7 @@ When investigating server issues (like the 2026-02-13 systemd-journald crash):
    ```bash
    # Export logs to file
    gcloud logging read "resource.labels.instance_id=\"656c1763-11a1-49bb-bbc3-9782acf15aef\"" \
-     --project=kids-ai-data-analysis \
+     --project=your-gcp-project \
      --limit=1000 \
      --format=json \
      --freshness=1d > server_logs.json
diff --git a/dev_docs/session_explore.md b/dev_docs/session_explore.md
index d6b7e41..bc5e932 100644
--- a/dev_docs/session_explore.md
+++ b/dev_docs/session_explore.md
@@ -4,7 +4,7 @@ Guide for exploring Claude Code session transcripts to identify friction points
 
 ## Session Data Location
 
-**Server:** `data-broker-for-claude` (alias: `kids`)
+**Server:** `your-server` (alias: `kids`)
 **Path:** `/data/user_sessions/`
 
 Sessions are collected by systemd service `session-collector.timer` (runs every 30 minutes).
@@ -14,12 +14,12 @@ Sessions are collected by systemd service `session-collector.timer` (runs every
 Sessions are organized by user:
 ```
 /data/user_sessions/
-├── petr/
+├── john/
 │   ├── 2026-02-10_49898dbe-5045-45f5-9177-2ff10917de4a.jsonl
 │   └── ...
-├── martin.matejka/
+├── mike.brown/
 │   └── ...
-└── jakub.sochan/
+└── sam.taylor/
     └── ...
 ```
 
@@ -29,10 +29,10 @@ Session files are owned by `root:data-ops` with `-rw-------` permissions, making
 
 ```bash
 # This FAILS
-scp kids:/data/user_sessions/petr/session.jsonl .
+scp kids:/data/user_sessions/john/session.jsonl .
 
 # Use this instead
-ssh kids "sudo cat /data/user_sessions/petr/session.jsonl" > session.jsonl
+ssh kids "sudo cat /data/user_sessions/john/session.jsonl" > session.jsonl
 ```
 
 ---
@@ -79,7 +79,7 @@ total_time = sum(event['data']['elapsedTimeSeconds'] for event in bash_events)
 
 **Example:**
 ```
-Session petr.hunka_2026-02-09_19c0a02f:
+Session john.doe_2026-02-09_19c0a02f:
   First event: 2026-02-05 16:06:52
   Last event:  2026-02-09 15:18:50
   Span: 3 days, 23 hours
@@ -166,7 +166,7 @@ for cmd_id, times in commands.items():
 **Example:**
 ```
 Issue #84 fixed: 2026-02-06 21:37:49
-Session file: petr.hunka_2026-02-09_19c0a02f.jsonl
+Session file: john.doe_2026-02-09_19c0a02f.jsonl
 File mtime: 2026-02-09 20:50 (within 48h filter)
 
 BUT: Session started 2026-02-05 15:56 (BEFORE fix!)
@@ -339,17 +339,17 @@ ssh kids "ls /data/user_sessions/ | wc -l"
 ssh kids "find /data/user_sessions -name '*.jsonl' -mtime -7"
 
 # Find sessions by user
-ssh kids "ls /data/user_sessions/ | grep '^petr-'"
+ssh kids "ls /data/user_sessions/ | grep '^john-'"
 ```
 
 ### Download Sessions for Local Analysis
 
 ```bash
 # Download specific session
-scp kids:/data/user_sessions/petr-2024-12-15-abc123.jsonl .
+scp kids:/data/user_sessions/john-2024-12-15-abc123.jsonl .
 
 # Download all sessions for a user
-scp kids:/data/user_sessions/petr-*.jsonl ./sessions/
+scp kids:/data/user_sessions/john-*.jsonl ./sessions/
 
 # Download recent sessions
 ssh kids "find /data/user_sessions -mtime -7" | xargs -I {} scp kids:{} ./sessions/
@@ -828,7 +828,7 @@ def calculate_active_time(session_file, gap_threshold_minutes=10):
     }
 
 # Example usage
-session = Path("~/session-analysis/raw/petr.hunka_2026-02-09_19c0a02f.jsonl").expanduser()
+session = Path("~/session-analysis/raw/john.doe_2026-02-09_19c0a02f.jsonl").expanduser()
 result = calculate_active_time(session)
 
 print(f"Total span: {result['total_span_hours']:.2f} hours")
diff --git a/server/setup.sh b/server/setup.sh
index 2874f82..7ed88af 100755
--- a/server/setup.sh
+++ b/server/setup.sh
@@ -33,7 +33,7 @@ done
 
 # Create deploy user (for CI/CD automated deployment)
 if ! id deploy > /dev/null 2>&1; then
-    useradd -r -m -s /bin/bash -G data-ops deploy
+    useradd -r -m -s /usr/sbin/nologin -G data-ops deploy
     echo "Created deploy user"
 fi
 
diff --git a/server/webapp-setup.sh b/server/webapp-setup.sh
index 5849e08..c33f463 100755
--- a/server/webapp-setup.sh
+++ b/server/webapp-setup.sh
@@ -84,17 +84,15 @@ echo "Adding www-data to data-ops group..."
 usermod -aG data-ops www-data
 
 # Install sudoers rules for www-data (from repo, includes all required rules)
+# Validate BEFORE copying to prevent broken sudo if syntax is invalid
 echo "Configuring sudoers..."
 SUDOERS_FILE="/etc/sudoers.d/webapp"
-cp "${REPO_DIR}/server/sudoers-webapp" "$SUDOERS_FILE"
-chmod 440 "$SUDOERS_FILE"
-
-# Validate sudoers syntax
-if ! visudo -cf "$SUDOERS_FILE"; then
-    echo "ERROR: Invalid sudoers syntax"
-    rm -f "$SUDOERS_FILE"
+SUDOERS_SRC="${REPO_DIR}/server/sudoers-webapp"
+if ! visudo -cf "$SUDOERS_SRC"; then
+    echo "ERROR: Invalid sudoers syntax in $SUDOERS_SRC"
     exit 1
 fi
+install -m 440 "$SUDOERS_SRC" "$SUDOERS_FILE"
 
 # Install systemd service
 echo "Installing systemd service..."