diff --git a/src/figures.py b/src/figures.py
index 77a2d07..974e902 100644
--- a/src/figures.py
+++ b/src/figures.py
@@ -2,6 +2,7 @@ import math
 from datetime import datetime
 from typing import Literal
 
+import dash_ag_grid as dag
 import dash_bootstrap_components as dbc
 import dash_leaflet as dl
 import dash_leaflet.express as dlx
@@ -1066,3 +1067,29 @@ def get_top_org_table(data, org_type: str, extra_columns: list, filters: bool =
         tooltip_header=tooltip,
         filter_action="native" if filters else "none",
     )
+
+
+def ag_grid(grid_id: str, column_defs: list[dict]) -> "dag.AgGrid":
+    """Grille AG Grid server-side (infinite) pour la page Tableau.
+
+    Apparence de base d'AG Grid (aucun thème custom au Lot 1).
+    """
+    return dag.AgGrid(
+        id=grid_id,
+        columnDefs=column_defs,
+        defaultColDef={"resizable": True, "minWidth": 120, "floatingFilter": True},
+        rowModelType="infinite",
+        dangerously_allow_code=True,  # rend le HTML <a> des cellules liens
+        dashGridOptions={
+            "cacheBlockSize": 100,
+            "maxBlocksInCache": 10,
+            "rowBuffer": 0,
+            "infiniteInitialRowCount": 100,
+            "suppressCellFocus": True,
+        },
+        columnSize="responsiveSizeToFit",
+        style={"height": "70vh", "width": "100%"},
+        persistence=True,
+        persistence_type="local",
+        persisted_props=["filterModel", "columnState"],
+    )
diff --git a/src/utils/grid.py b/src/utils/grid.py
index 674b11c..f175b97 100644
--- a/src/utils/grid.py
+++ b/src/utils/grid.py
@@ -1,6 +1,9 @@
 """Datasource server-side pour AG Grid (infinite row model)."""
 
+import polars as pl
+
 from src.db import count_marches, query_marches, schema
+from src.figures import DATA_SCHEMA
 from src.utils.query_ast import ast_to_sql, filtermodel_to_ast, sort_model_to_sql
 from src.utils.table import postprocess_page
 
@@ -32,3 +35,60 @@ def fetch_grid_page(
     )
     page = postprocess_page(page)
     return page.to_dicts(), total
+
+
+_LINK_COLUMNS = {
+    "marche",
+    "uid",
+    "acheteur_id",
+    "acheteur_nom",
+    "titulaire_id",
+    "titulaire_nom",
+    "sourceFile",
+}
+
+
+def _filter_for(col_type) -> str:
+    if col_type.is_numeric():
+        return "agNumberColumnFilter"
+    if col_type == pl.Date:
+        return "agDateColumnFilter"
+    return "agTextColumnFilter"
+
+
+def grid_column_defs(hidden_columns=None):
+    """columnDefs dérivés du schéma DuckDB.
+
+    'marche' (colonne loupe ajoutée par postprocess_page) est placée en tête.
+    """
+    hidden = set(hidden_columns or [])
+    defs = [
+        {
+            "field": "marche",
+            "headerName": "",
+            "cellRenderer": "markdown",
+            "filter": False,
+            "sortable": False,
+            "maxWidth": 60,
+            "pinned": "left",
+        }
+    ]
+    for col in schema.names():
+        meta = DATA_SCHEMA.get(col, {})
+        col_type = schema[col]
+        col_def = {
+            "field": col,
+            "headerName": meta.get("title", col),
+            "filter": _filter_for(col_type),
+            "floatingFilter": True,
+            "sortable": True,
+            "hide": col in hidden,
+        }
+        if meta.get("description"):
+            col_def["headerTooltip"] = (
+                f"{meta.get('title', col)} ({col}) — {meta['description']}"
+            )
+        if col in _LINK_COLUMNS:
+            col_def["cellRenderer"] = "markdown"
+        defs.append(col_def)
+    return defs
diff --git a/tests/test_grid.py b/tests/test_grid.py
index 22020be..9d603ac 100644
--- a/tests/test_grid.py
+++ b/tests/test_grid.py
@@ -1,4 +1,22 @@
-from src.utils.grid import fetch_grid_page
+from src.utils.grid import fetch_grid_page, grid_column_defs
+
+
+def test_column_defs_have_field_and_filter():
+    defs = grid_column_defs(hidden_columns=[])
+    by_field = {d["field"]: d for d in defs}
+    assert "objet" in by_field
+    # filtre texte par défaut
+    assert by_field["objet"]["filter"] == "agTextColumnFilter"
+    # montant est numérique
+    assert by_field["montant"]["filter"] == "agNumberColumnFilter"
+    # headerTooltip présent (définition de colonne)
+    assert "headerTooltip" in by_field["objet"]
+
+
+def test_column_defs_hidden_flag():
+    defs = grid_column_defs(hidden_columns=["objet"])
+    by_field = {d["field"]: d for d in defs}
+    assert by_field["objet"]["hide"] is True
 
 
 def test_fetch_grid_page_returns_rows_and_count():