diff --git a/web/src/padelnomics/admin/pipeline_routes.py b/web/src/padelnomics/admin/pipeline_routes.py
index 79b632f..cea4070 100644
--- a/web/src/padelnomics/admin/pipeline_routes.py
+++ b/web/src/padelnomics/admin/pipeline_routes.py
@@ -66,6 +66,226 @@ _BLOCKED_SQL_RE = re.compile(
     re.IGNORECASE,
 )
 
+# ── Lineage DAG ───────────────────────────────────────────────────────────────
+#
+# Canonical model dependency map: model_name → [upstream_dependencies].
+# Layer is derived from name prefix: stg_* = staging, dim_*/fct_* = foundation,
+# everything else = serving.
+# Update this dict whenever models are added or removed from transform/.
+_DAG: dict[str, list[str]] = {
+    # Staging — read landing zone files, no model deps
+    "stg_padel_courts": [],
+    "stg_playtomic_venues": [],
+    "stg_playtomic_resources": [],
+    "stg_playtomic_opening_hours": [],
+    "stg_playtomic_availability": [],
+    "stg_population": [],
+    "stg_population_usa": [],
+    "stg_population_uk": [],
+    "stg_population_geonames": [],
+    "stg_income": [],
+    "stg_income_usa": [],
+    "stg_city_labels": [],
+    "stg_nuts2_boundaries": [],
+    "stg_regional_income": [],
+    "stg_tennis_courts": [],
+    # Foundation
+    "dim_venues": ["stg_playtomic_venues", "stg_playtomic_resources", "stg_padel_courts"],
+    "dim_cities": [
+        "dim_venues", "stg_income", "stg_city_labels",
+        "stg_population", "stg_population_usa", "stg_population_uk", "stg_population_geonames",
+    ],
+    "dim_locations": [
+        "stg_population_geonames", "stg_income", "stg_nuts2_boundaries",
+        "stg_regional_income", "stg_income_usa", "stg_padel_courts", "stg_tennis_courts",
+    ],
+    "dim_venue_capacity": [
+        "stg_playtomic_venues", "stg_playtomic_resources", "stg_playtomic_opening_hours",
+    ],
+    "fct_availability_slot": ["stg_playtomic_availability"],
+    "fct_daily_availability": ["fct_availability_slot", "dim_venue_capacity"],
+    # Serving
+    "venue_pricing_benchmarks": ["fct_daily_availability"],
+    "city_market_profile": ["dim_cities", "venue_pricing_benchmarks"],
+    "planner_defaults": ["venue_pricing_benchmarks", "city_market_profile"],
+    "location_opportunity_profile": ["dim_locations"],
+    "pseo_city_costs_de": [
+        "city_market_profile", "planner_defaults", "location_opportunity_profile",
+    ],
+    "pseo_city_pricing": ["venue_pricing_benchmarks", "city_market_profile"],
+    "pseo_country_overview": ["pseo_city_costs_de"],
+}
+
+
+def _classify_layer(name: str) -> str:
+    """Return 'staging', 'foundation', or 'serving' for a model name."""
+    if name.startswith("stg_"):
+        return "staging"
+    if name.startswith("dim_") or name.startswith("fct_"):
+        return "foundation"
+    return "serving"
+
+
+def _render_lineage_svg(dag: dict[str, list[str]]) -> str:
+    """Render the 3-layer model dependency DAG as an SVG string.
+
+    Layout: three vertical swim lanes (staging / foundation / serving) with
+    nodes stacked top-to-bottom in each lane.  Edges are cubic bezier paths
+    flowing left-to-right.  No external dependencies — pure Python string
+    construction.
+    """
+    # ── Layout constants ───────────────────────────────────────────────────
+    CHAR_WIDTH_PX = 7.4          # approximate monospace char width at 11px
+    NODE_PAD_H = 10              # horizontal padding inside node rect
+    NODE_H = 26                  # node height
+    NODE_VGAP = 10               # vertical gap between nodes in same lane
+    LANE_PAD_TOP = 52            # space for lane header
+    LANE_PAD_BOTTOM = 24
+    LANE_INNER_W = 210           # inner usable width per lane
+    LANE_GAP = 40                # gap between lanes
+    LANE_PAD_LEFT = 16           # left padding inside lane bg
+
+    LANE_COLORS = {
+        "staging":    {"bg": "#F0FDF4", "border": "#BBF7D0", "accent": "#16A34A",
+                       "fill": "#DCFCE7", "text": "#14532D"},
+        "foundation": {"bg": "#EFF6FF", "border": "#BFDBFE", "accent": "#1D4ED8",
+                       "fill": "#DBEAFE", "text": "#1E3A8A"},
+        "serving":    {"bg": "#FFFBEB", "border": "#FDE68A", "accent": "#D97706",
+                       "fill": "#FEF3C7", "text": "#78350F"},
+    }
+    LANE_ORDER = ["staging", "foundation", "serving"]
+    LANE_LABELS = {"staging": "STAGING", "foundation": "FOUNDATION", "serving": "SERVING"}
+
+    # ── Group and sort nodes per layer ─────────────────────────────────────
+    # Count how many nodes each node is depended upon by (downstream count)
+    downstream: dict[str, int] = {n: 0 for n in dag}
+    for deps in dag.values():
+        for d in deps:
+            downstream[d] = downstream.get(d, 0) + 1
+
+    layers: dict[str, list[str]] = {"staging": [], "foundation": [], "serving": []}
+    for name in dag:
+        layers[_classify_layer(name)].append(name)
+    for layer_name, nodes in layers.items():
+        # Sort: most-connected first (hub nodes near vertical center), then alpha
+        nodes.sort(key=lambda n: (-downstream.get(n, 0), n))
+
+    # ── Compute node widths ────────────────────────────────────────────────
+    def node_w(name: str) -> float:
+        return max(len(name) * CHAR_WIDTH_PX + NODE_PAD_H * 2, 80.0)
+
+    # ── Assign positions ───────────────────────────────────────────────────
+    # x = left edge of lane background; node rect starts at x + LANE_PAD_LEFT
+    lane_x: dict[str, float] = {}
+    x_cursor = 0.0
+    for lane in LANE_ORDER:
+        lane_x[lane] = x_cursor
+        x_cursor += LANE_INNER_W + LANE_PAD_LEFT * 2 + LANE_GAP
+
+    positions: dict[str, tuple[float, float]] = {}  # node → (rect_x, rect_y)
+    lane_heights: dict[str, float] = {}
+    for lane in LANE_ORDER:
+        nodes = layers[lane]
+        y = LANE_PAD_TOP
+        for name in nodes:
+            rx = lane_x[lane] + LANE_PAD_LEFT
+            positions[name] = (rx, y)
+            y += NODE_H + NODE_VGAP
+        lane_heights[lane] = y + LANE_PAD_BOTTOM - NODE_VGAP
+
+    total_w = x_cursor - LANE_GAP
+    total_h = max(lane_heights.values())
+
+    # ── SVG assembly ───────────────────────────────────────────────────────
+    parts: list[str] = []
+
+    # Arrowhead marker
+    parts.append(
+        '<defs>'
+        '<marker id="arr" markerWidth="6" markerHeight="6" refX="5" refY="3" orient="auto">'
+        '<path d="M0,0 L0,6 L6,3 z" fill="#94A3B8"/>'
+        '</marker>'
+        '<marker id="arr-hi" markerWidth="6" markerHeight="6" refX="5" refY="3" orient="auto">'
+        '<path d="M0,0 L0,6 L6,3 z" fill="#1D4ED8"/>'
+        '</marker>'
+        '</defs>'
+    )
+
+    # Lane backgrounds + headers
+    for lane in LANE_ORDER:
+        c = LANE_COLORS[lane]
+        lx = lane_x[lane]
+        lw = LANE_INNER_W + LANE_PAD_LEFT * 2
+        lh = lane_heights[lane]
+        parts.append(
+            f'<rect x="{lx:.1f}" y="0" width="{lw:.1f}" height="{lh:.1f}" '
+            f'rx="10" fill="{c["bg"]}" stroke="{c["border"]}" stroke-width="1"/>'
+        )
+        # Lane header label
+        label_x = lx + lw / 2
+        parts.append(
+            f'<text x="{label_x:.1f}" y="28" text-anchor="middle" '
+            f'font-family="\'DM Sans\',ui-sans-serif,system-ui,sans-serif" '
+            f'font-size="10" font-weight="700" letter-spacing="1.5" '
+            f'fill="{c["accent"]}">{LANE_LABELS[lane]}</text>'
+        )
+        # Divider line under header
+        parts.append(
+            f'<line x1="{lx + 12:.1f}" y1="36" x2="{lx + lw - 12:.1f}" y2="36" '
+            f'stroke="{c["border"]}" stroke-width="1"/>'
+        )
+
+    # Edges (rendered before nodes so nodes appear on top)
+    for name, deps in dag.items():
+        if not deps:
+            continue
+        tx, ty = positions[name]
+        tgt_cx = tx               # left edge of target node
+        tgt_cy = ty + NODE_H / 2
+        for dep in deps:
+            sx, sy = positions[dep]
+            sw = node_w(dep)
+            src_cx = sx + sw      # right edge of source node
+            src_cy = sy + NODE_H / 2
+            cpx1 = src_cx + (tgt_cx - src_cx) * 0.45
+            cpx2 = tgt_cx - (tgt_cx - src_cx) * 0.45
+            d = f"M{src_cx:.1f},{src_cy:.1f} C{cpx1:.1f},{src_cy:.1f} {cpx2:.1f},{tgt_cy:.1f} {tgt_cx:.1f},{tgt_cy:.1f}"
+            parts.append(
+                f'<path class="lineage-edge" data-from="{dep}" data-to="{name}" '
+                f'd="{d}" fill="none" stroke="#CBD5E1" stroke-width="1" '
+                f'marker-end="url(#arr)"/>'
+            )
+
+    # Nodes
+    for name in dag:
+        layer = _classify_layer(name)
+        c = LANE_COLORS[layer]
+        rx, ry = positions[name]
+        rw = node_w(name)
+        text_x = rx + NODE_PAD_H
+        text_y = ry + NODE_H / 2 + 4  # +4 for baseline alignment
+        parts.append(
+            f'<g class="lineage-node" data-model="{name}">'
+            f'<rect x="{rx:.1f}" y="{ry:.1f}" width="{rw:.1f}" height="{NODE_H}" '
+            f'rx="5" fill="{c["fill"]}" stroke="{c["border"]}" stroke-width="1"/>'
+            # Left accent bar
+            f'<rect x="{rx:.1f}" y="{ry:.1f}" width="3" height="{NODE_H}" '
+            f'rx="5" fill="{c["accent"]}"/>'
+            f'<text x="{text_x:.1f}" y="{text_y:.1f}" '
+            f'font-family="\'Commit Mono\',ui-monospace,\'Cascadia Code\',monospace" '
+            f'font-size="11" fill="{c["text"]}">{name}</text>'
+            '</g>'
+        )
+
+    svg_inner = "\n".join(parts)
+    return (
+        f'<svg class="lineage-svg" viewBox="0 0 {total_w:.1f} {total_h:.1f}" '
+        f'xmlns="http://www.w3.org/2000/svg" '
+        f'style="width:100%;height:auto;min-width:{total_w:.0f}px">'
+        f'{svg_inner}'
+        f'</svg>'
+    )
+
 
 # ── Sidebar data injection (same pattern as pseo_routes.py) ──────────────────
 
@@ -545,6 +765,21 @@ async def pipeline_trigger_extract():
     return redirect(url_for("pipeline.pipeline_dashboard"))
 
 
+# ── Lineage tab ───────────────────────────────────────────────────────────────
+
+
+@bp.route("/lineage")
+@role_required("admin")
+async def pipeline_lineage():
+    """HTMX tab: data lineage DAG visualization."""
+    svg = await asyncio.to_thread(_render_lineage_svg, _DAG)
+    return await render_template(
+        "admin/partials/pipeline_lineage.html",
+        lineage_svg=svg,
+        node_count=len(_DAG),
+    )
+
+
 # ── Catalog tab ───────────────────────────────────────────────────────────────
 
 
diff --git a/web/src/padelnomics/admin/templates/admin/partials/pipeline_lineage.html b/web/src/padelnomics/admin/templates/admin/partials/pipeline_lineage.html
new file mode 100644
index 0000000..825ed08
--- /dev/null
+++ b/web/src/padelnomics/admin/templates/admin/partials/pipeline_lineage.html
@@ -0,0 +1,50 @@
+<!-- Pipeline Lineage Tab: 3-layer DAG visualization (server-rendered SVG) -->
+
+<div class="card">
+  <p class="card-header">Data Lineage
+    <span class="text-xs font-normal text-slate ml-2">
+      {{ node_count }} models &mdash; staging &rarr; foundation &rarr; serving
+    </span>
+  </p>
+  <div style="overflow-x:auto;padding:1rem 0.5rem 0.5rem">
+    {{ lineage_svg | safe }}
+  </div>
+</div>
+
+<style>
+  .lineage-node { cursor: default; }
+  .lineage-node rect:first-of-type { transition: filter 0.12s; }
+  .lineage-node:hover rect:first-of-type { filter: brightness(0.94); }
+  .lineage-edge { transition: stroke 0.12s, stroke-width 0.12s, opacity 0.12s; }
+  .lineage-edge.hi { stroke: #1D4ED8 !important; stroke-width: 2 !important; marker-end: url(#arr-hi) !important; }
+  .lineage-edge.dim { opacity: 0.12; }
+</style>
+
+<script>
+(function () {
+  var svg = document.querySelector('.lineage-svg');
+  if (!svg) return;
+  var nodes = svg.querySelectorAll('.lineage-node');
+  var edges = svg.querySelectorAll('.lineage-edge');
+
+  nodes.forEach(function (g) {
+    var model = g.dataset.model;
+    g.addEventListener('mouseenter', function () {
+      edges.forEach(function (e) {
+        if (e.dataset.from === model || e.dataset.to === model) {
+          e.classList.add('hi');
+          e.classList.remove('dim');
+        } else {
+          e.classList.add('dim');
+          e.classList.remove('hi');
+        }
+      });
+    });
+    g.addEventListener('mouseleave', function () {
+      edges.forEach(function (e) {
+        e.classList.remove('hi', 'dim');
+      });
+    });
+  });
+})();
+</script>
diff --git a/web/src/padelnomics/admin/templates/admin/pipeline.html b/web/src/padelnomics/admin/templates/admin/pipeline.html
index f6ff572..bbc2eb6 100644
--- a/web/src/padelnomics/admin/templates/admin/pipeline.html
+++ b/web/src/padelnomics/admin/templates/admin/pipeline.html
@@ -93,6 +93,10 @@
             hx-get="{{ url_for('pipeline.pipeline_query_editor') }}"
             hx-target="#pipeline-tab-content" hx-swap="innerHTML"
             hx-trigger="click">Query</button>
+    <button data-tab="lineage"
+            hx-get="{{ url_for('pipeline.pipeline_lineage') }}"
+            hx-target="#pipeline-tab-content" hx-swap="innerHTML"
+            hx-trigger="click">Lineage</button>
   </div>
 
   <!-- Tab content (Overview loads on page load) -->