diff --git a/deploy/deploy-test-server.sh b/deploy/deploy-test-server.sh
index 2989a28..8cebe84 100755
--- a/deploy/deploy-test-server.sh
+++ b/deploy/deploy-test-server.sh
@@ -258,6 +258,16 @@ print(\" \".join(str(r[0]) for r in c.execute(\"SELECT id FROM overlays\")))
     $sudo_cmd chown left4me:left4me "$overlay_orphan_sentinel"
 fi
 
+# Seed example script overlays (cedapug, l4d2center, competitive_rework, ...)
+# as system-wide rows from /opt/left4me/examples/script-overlays/. Idempotent:
+# subsequent deploys refresh the script body in place, leaving the row id and
+# overlay directory intact.
+run_left4me_with_env env \
+    JOB_WORKER_ENABLED=false \
+    PYTHONPATH=/opt/left4me \
+    /opt/left4me/.venv/bin/flask --app l4d2web.app:create_app \
+    seed-script-overlays /opt/left4me/examples/script-overlays
+
 $sudo_cmd systemctl daemon-reload
 $sudo_cmd systemctl enable --now left4me-web.service
 $sudo_cmd systemctl restart left4me-web.service
diff --git a/examples/script-overlays/cedapug_maps.sh b/examples/script-overlays/cedapug_maps.sh
new file mode 100644
index 0000000..88a81c1
--- /dev/null
+++ b/examples/script-overlays/cedapug_maps.sh
@@ -0,0 +1,109 @@
+#!/bin/bash
+# Cedapug custom-maps overlay.
+# Scrapes the JS map list at https://cedapug.com/custom and keeps
+# $OVERLAY/left4dead2/addons/ in sync. Re-downloads only when the zip's
+# Last-Modified header changed.
+set -euo pipefail
+
+CEDAPUG_HOST="https://cedapug.com"
+LIST_URL="$CEDAPUG_HOST/custom"
+ADDONS_DIR="$OVERLAY/left4dead2/addons"
+STATE_DIR="$OVERLAY/.cedapug"
+WORK_DIR="$STATE_DIR/work"
+MANIFEST="$STATE_DIR/manifest.tsv"   # zip_basename \t last_modified \t vpk1,vpk2,...
+
+mkdir -p "$ADDONS_DIR" "$STATE_DIR" "$WORK_DIR"
+
+# --- 1. Discover the current zip list -----------------------------------
+# The page embeds the map list inside renderCustomMapDownloads([...]) with
+# JSON-escaped slashes (\/maps\/foo.zip). Unescape with sed before grepping.
+echo ":: fetching $LIST_URL"
+mapfile -t ZIP_PATHS < <(
+    curl -fsSL --retry 3 --retry-delay 2 "$LIST_URL" \
+        | sed 's@\\/@/@g' \
+        | grep -oE '"/maps/[A-Za-z0-9_.+-]+\.zip"' \
+        | tr -d '"' \
+        | sort -u
+)
+if [[ ${#ZIP_PATHS[@]} -eq 0 ]]; then
+    echo "!! no map zips found on $LIST_URL — page format may have changed" >&2
+    exit 1
+fi
+echo ":: ${#ZIP_PATHS[@]} custom map zip(s) listed"
+
+# --- 2. Load previous manifest ------------------------------------------
+declare -A PREV_LM PREV_VPKS
+if [[ -f "$MANIFEST" ]]; then
+    while IFS=$'\t' read -r zname lm vpks; do
+        [[ -n "$zname" ]] || continue
+        PREV_LM[$zname]=$lm
+        PREV_VPKS[$zname]=$vpks
+    done < "$MANIFEST"
+fi
+
+# --- 3. Download / extract each desired zip -----------------------------
+declare -A NEW_LM NEW_VPKS
+for zpath in "${ZIP_PATHS[@]}"; do
+    zname="${zpath##*/}"
+    url="$CEDAPUG_HOST$zpath"
+
+    lm="$(curl -fsSI --retry 3 --retry-delay 2 "$url" \
+        | awk 'BEGIN{IGNORECASE=1} /^last-modified:/ {sub(/^[^:]*:[[:space:]]*/, ""); gsub(/\r/, ""); print; exit}')"
+    NEW_LM[$zname]=$lm
+
+    prev_lm="${PREV_LM[$zname]:-}"
+    prev_vpks="${PREV_VPKS[$zname]:-}"
+
+    # Skip if Last-Modified matches AND every recorded vpk is still on disk.
+    if [[ -n "$lm" && "$lm" == "$prev_lm" && -n "$prev_vpks" ]]; then
+        all_present=1
+        IFS=',' read -r -a v_arr <<<"$prev_vpks"
+        for v in "${v_arr[@]}"; do
+            [[ -f "$ADDONS_DIR/$v" ]] || { all_present=0; break; }
+        done
+        if (( all_present )); then
+            echo ":: $zname unchanged (Last-Modified: $lm) — skipped"
+            NEW_VPKS[$zname]=$prev_vpks
+            continue
+        fi
+    fi
+
+    echo ":: downloading $zname"
+    zfile="$WORK_DIR/$zname"
+    curl -fSL --retry 3 --retry-delay 2 -o "$zfile" "$url"
+
+    7z x -y -bd -o"$ADDONS_DIR" "$zfile" '*.vpk' >/dev/null
+
+    vpk_list="$(7z l -slt -ba "$zfile" \
+        | awk '/^Path = .*\.vpk$/ {sub(/^Path = /, ""); print}' \
+        | paste -sd, -)"
+    if [[ -z "$vpk_list" ]]; then
+        echo "!! warning: $zname contained no .vpk — leaving manifest entry empty" >&2
+    fi
+    NEW_VPKS[$zname]=$vpk_list
+
+    rm -f "$zfile"
+done
+
+# --- 4. Prune vpks from zips that disappeared from the listing ----------
+for old_zname in "${!PREV_VPKS[@]}"; do
+    if [[ -z "${NEW_LM[$old_zname]:-}" ]]; then
+        IFS=',' read -r -a old_v_arr <<<"${PREV_VPKS[$old_zname]}"
+        for v in "${old_v_arr[@]}"; do
+            if [[ -n "$v" && -f "$ADDONS_DIR/$v" ]]; then
+                echo ":: pruning $v (zip $old_zname no longer listed)"
+                rm -f "$ADDONS_DIR/$v"
+            fi
+        done
+    fi
+done
+
+# --- 5. Rewrite manifest -------------------------------------------------
+tmp_manifest="$(mktemp -p "$STATE_DIR")"
+for zname in "${!NEW_LM[@]}"; do
+    printf '%s\t%s\t%s\n' "$zname" "${NEW_LM[$zname]}" "${NEW_VPKS[$zname]:-}" >>"$tmp_manifest"
+done
+mv -f "$tmp_manifest" "$MANIFEST"
+
+rm -rf "$WORK_DIR"
+echo ":: done — ${#NEW_LM[@]} zip(s) tracked, addons/ in sync"
diff --git a/examples/script-overlays/competitive_rework.sh b/examples/script-overlays/competitive_rework.sh
new file mode 100644
index 0000000..b5412d2
--- /dev/null
+++ b/examples/script-overlays/competitive_rework.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# L4D2 Competitive Rework overlay.
+# Pulls the master branch of SirPlease/L4D2-Competitive-Rework as a tarball
+# and extracts it into $OVERLAY/left4dead2/. Skipped on subsequent rebuilds
+# once cfg/cfgogl/ is present — wipe the overlay to force a refresh.
+# https://github.com/SirPlease/L4D2-Competitive-Rework
+set -xeuo pipefail
+
+DEST="$OVERLAY/left4dead2"
+mkdir -p "$DEST"
+
+if [[ ! -d "$DEST/cfg/cfgogl" ]]; then
+    curl -fsSL https://github.com/SirPlease/L4D2-Competitive-Rework/archive/refs/heads/master.tar.gz \
+        | tar -xz --strip-components=1 -C "$DEST"
+fi
diff --git a/examples/script-overlays/l4d2center_maps.sh b/examples/script-overlays/l4d2center_maps.sh
new file mode 100644
index 0000000..6a7cc5e
--- /dev/null
+++ b/examples/script-overlays/l4d2center_maps.sh
@@ -0,0 +1,48 @@
+#!/bin/bash
+set -xeuo pipefail
+
+mkdir -p /overlay/left4dead2/addons
+cd /overlay/left4dead2/addons
+
+for cmd in curl md5sum 7z; do
+    command -v "$cmd" >/dev/null || { echo "Missing: $cmd" >&2; exit 1; }
+done
+
+CSV_URL="https://l4d2center.com/maps/servers/index.csv"
+TEMP_CSV=$(mktemp)
+trap 'rm -f "$TEMP_CSV"' EXIT
+curl -fsSL -o "$TEMP_CSV" "$CSV_URL"
+
+declare -A map_md5 map_links
+{
+    IFS= read -r _header
+    while IFS=';' read -r Name _Size MD5 DownloadLink || [[ $Name ]]; do
+        Name=$(echo "$Name" | xargs)
+        MD5=$(echo "$MD5"  | xargs)
+        DownloadLink=$(echo "$DownloadLink" | xargs)
+        map_md5["$Name"]="$MD5"
+        map_links["$Name"]="$DownloadLink"
+    done
+} < "$TEMP_CSV"
+
+shopt -s nullglob
+for file in *.vpk; do
+    if [[ -z "${map_md5[$file]:-}" ]]; then
+        rm -f "$file"
+    elif [[ "$(md5sum "$file" | awk '{print $1}')" != "${map_md5[$file]}" ]]; then
+        rm -f "$file"
+    fi
+done
+
+for vpk in "${!map_md5[@]}"; do
+    [[ -f "$vpk" ]] && continue
+    url="${map_links[$vpk]}"
+    [[ -n "$url" ]] || continue
+    encoded=$(printf '%s' "$url" | sed 's/ /%20/g')
+    TEMP_7Z=$(mktemp --suffix=.7z)
+    curl -fsSL -o "$TEMP_7Z" "$encoded"
+    7z x -y "$TEMP_7Z"
+    rm -f "$TEMP_7Z"
+done
+
+echo "Synchronization complete."
diff --git a/examples/script-overlays/tickrate.sh b/examples/script-overlays/tickrate.sh
new file mode 100644
index 0000000..5765935
--- /dev/null
+++ b/examples/script-overlays/tickrate.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+# Tickrate overlay: server.cfg with high-rate settings + the tickrate_enabler
+# addon (DLL/SO/VDF) from SirPlease/L4D2-Competitive-Rework.
+# https://github.com/SirPlease/L4D2-Competitive-Rework/blob/7ecc3a32a5e2180d6607a40119ff2f3c072502a9/cfg/server.cfg#L58-L69
+# https://www.programmersought.com/article/513810199514/
+set -xeuo pipefail
+
+CFG_DIR="$OVERLAY/left4dead2/cfg"
+ADDONS_DIR="$OVERLAY/left4dead2/addons"
+mkdir -p "$CFG_DIR" "$ADDONS_DIR"
+
+cat <<'EOF' > "$CFG_DIR/server.cfg"
+# https://github.com/SirPlease/L4D2-Competitive-Rework/blob/7ecc3a32a5e2180d6607a40119ff2f3c072502a9/cfg/server.cfg#L58-L69
+sv_minrate 100000
+sv_maxrate 100000
+nb_update_frequency 0.014
+net_splitpacket_maxrate 50000
+net_maxcleartime 0.0001
+fps_max 0
+EOF
+
+for file in tickrate_enabler.dll tickrate_enabler.so tickrate_enabler.vdf; do
+    curl -fsSL "https://github.com/SirPlease/L4D2-Competitive-Rework/raw/refs/heads/master/addons/${file}" \
+        -o "$ADDONS_DIR/${file}"
+done
diff --git a/l4d2web/cli.py b/l4d2web/cli.py
index a9495be..8ac84e3 100644
--- a/l4d2web/cli.py
+++ b/l4d2web/cli.py
@@ -1,4 +1,5 @@
 import os
+from pathlib import Path
 
 import click
 from sqlalchemy.exc import IntegrityError
@@ -6,7 +7,11 @@ from sqlalchemy import select
 
 from l4d2web.auth import hash_password
 from l4d2web.db import session_scope
-from l4d2web.models import User
+from l4d2web.models import Overlay, User
+from l4d2web.services.overlay_creation import (
+    create_overlay_directory,
+    generate_overlay_path,
+)
 
 
 @click.command("promote-admin")
@@ -41,6 +46,50 @@ def create_user(username: str, admin: bool) -> None:
     click.echo(f"created user {username}")
 
 
+@click.command("seed-script-overlays")
+@click.argument(
+    "directory",
+    type=click.Path(exists=True, file_okay=False, path_type=Path),
+)
+def seed_script_overlays(directory: Path) -> None:
+    """Upsert one system-wide script overlay per *.sh file in DIRECTORY.
+
+    Overlay name = filename stem; user_id stays NULL. Existing rows by name
+    have their script refreshed in place. Hard-errors if a name collides
+    with a non-script overlay.
+    """
+    sh_files = sorted(p for p in directory.glob("*.sh") if p.stem)
+    if not sh_files:
+        click.echo(f"no *.sh files in {directory}", err=True)
+        return
+
+    with session_scope() as db:
+        for sh in sh_files:
+            name = sh.stem
+            content = sh.read_text()
+            existing = db.scalar(
+                select(Overlay).where(Overlay.name == name, Overlay.user_id.is_(None))
+            )
+            if existing is not None:
+                if existing.type != "script":
+                    raise click.ClickException(
+                        f"overlay {name!r} exists but is type={existing.type!r}, not script"
+                    )
+                existing.script = content
+                click.echo(f"updated {name} (id={existing.id})")
+            else:
+                overlay = Overlay(
+                    name=name, path="", type="script", user_id=None, script=content
+                )
+                db.add(overlay)
+                db.flush()
+                overlay.path = generate_overlay_path(overlay.id)
+                db.flush()
+                create_overlay_directory(overlay)
+                click.echo(f"created {name} (id={overlay.id})")
+
+
 def register_cli(app) -> None:
     app.cli.add_command(promote_admin)
     app.cli.add_command(create_user)
+    app.cli.add_command(seed_script_overlays)
diff --git a/l4d2web/tests/test_seed_script_overlays.py b/l4d2web/tests/test_seed_script_overlays.py
new file mode 100644
index 0000000..d7765f7
--- /dev/null
+++ b/l4d2web/tests/test_seed_script_overlays.py
@@ -0,0 +1,79 @@
+from pathlib import Path
+
+from l4d2web.app import create_app
+from l4d2web.db import init_db, session_scope
+from l4d2web.models import Overlay
+
+
+def _make_app(tmp_path: Path, monkeypatch):
+    db_url = f"sqlite:///{tmp_path/'seed.db'}"
+    monkeypatch.setenv("DATABASE_URL", db_url)
+    monkeypatch.setenv("LEFT4ME_ROOT", str(tmp_path))
+    app = create_app({"TESTING": True, "DATABASE_URL": db_url, "SECRET_KEY": "test"})
+    init_db()
+    return app
+
+
+def test_seed_creates_system_wide_script_overlays(tmp_path: Path, monkeypatch) -> None:
+    app = _make_app(tmp_path, monkeypatch)
+    examples = tmp_path / "examples"
+    examples.mkdir()
+    (examples / "alpha.sh").write_text("#!/bin/bash\necho alpha\n")
+    (examples / "beta.sh").write_text("#!/bin/bash\necho beta\n")
+
+    result = app.test_cli_runner().invoke(args=["seed-script-overlays", str(examples)])
+
+    assert result.exit_code == 0, result.output
+    with session_scope() as db:
+        rows = db.query(Overlay).order_by(Overlay.name).all()
+        assert [(o.name, o.type, o.user_id, o.script.strip()) for o in rows] == [
+            ("alpha", "script", None, "#!/bin/bash\necho alpha"),
+            ("beta", "script", None, "#!/bin/bash\necho beta"),
+        ]
+        for o in rows:
+            assert (tmp_path / "overlays" / o.path).is_dir()
+
+
+def test_seed_refreshes_existing_script_overlay(tmp_path: Path, monkeypatch) -> None:
+    app = _make_app(tmp_path, monkeypatch)
+    examples = tmp_path / "examples"
+    examples.mkdir()
+    (examples / "alpha.sh").write_text("v1\n")
+
+    runner = app.test_cli_runner()
+    runner.invoke(args=["seed-script-overlays", str(examples)])
+    (examples / "alpha.sh").write_text("v2\n")
+    result = runner.invoke(args=["seed-script-overlays", str(examples)])
+
+    assert result.exit_code == 0, result.output
+    with session_scope() as db:
+        rows = db.query(Overlay).filter(Overlay.name == "alpha").all()
+        assert len(rows) == 1
+        assert rows[0].script.strip() == "v2"
+
+
+def test_seed_errors_on_type_collision(tmp_path: Path, monkeypatch) -> None:
+    app = _make_app(tmp_path, monkeypatch)
+    examples = tmp_path / "examples"
+    examples.mkdir()
+    (examples / "shared.sh").write_text("#!/bin/bash\n")
+
+    with session_scope() as db:
+        db.add(Overlay(name="shared", path="shared", type="workshop", user_id=None))
+
+    result = app.test_cli_runner().invoke(args=["seed-script-overlays", str(examples)])
+
+    assert result.exit_code != 0
+    assert "not script" in result.output
+
+
+def test_seed_no_files_is_noop(tmp_path: Path, monkeypatch) -> None:
+    app = _make_app(tmp_path, monkeypatch)
+    examples = tmp_path / "examples"
+    examples.mkdir()
+
+    result = app.test_cli_runner().invoke(args=["seed-script-overlays", str(examples)])
+
+    assert result.exit_code == 0
+    with session_scope() as db:
+        assert db.query(Overlay).count() == 0