diff --git a/tools/sprite-generation/server.py b/tools/sprite-generation/server.py
index 07e184f0..bb70aac2 100644
--- a/tools/sprite-generation/server.py
+++ b/tools/sprite-generation/server.py
@@ -41,6 +41,10 @@ class RejectRequest(BaseModel):
     dimension_id: int | None = None
 
 
+class RejectVariantRequest(BaseModel):
+    reason: str | None = None
+
+
 class RegenerateRequest(BaseModel):
     prompt: str | None = None
     dimension_id: int | None = None
@@ -58,6 +62,13 @@ class PipelineRunRequest(BaseModel):
     rescore: bool = False
 
 
+class PinSeedRequest(BaseModel):
+    seed: int
+    category: str
+    entity_id: str = ""
+    variant_id: int | None = None
+
+
 class GenerateRequest(BaseModel):
     category: str | None = None
     sprite_id: str | None = None
@@ -156,8 +167,8 @@ def create_app(
         return registry.get_scores(variant_id)
 
     @app.post("/api/variants/{variant_id:int}/reject")
-    def reject_variant(variant_id: int) -> dict:
-        registry.reject_variant(variant_id)
+    def reject_variant(variant_id: int, body: RejectVariantRequest = RejectVariantRequest()) -> dict:
+        registry.reject_variant(variant_id, body.reason)
         return {"status": "rejected", "variant_id": variant_id}
 
     @app.post("/api/sprites/{sprite_id:path}/regenerate")
@@ -210,7 +221,7 @@ def create_app(
         if proc is not None and proc.poll() is None:
             return {"status": "already_running", "pid": proc.pid}
 
-        cmd = [sys.executable, str(TOOL_DIR / "tools" / "advance.py")]
+        cmd = [sys.executable, "-u", str(TOOL_DIR / "tools" / "advance.py")]
         if body.scorers:
             cmd += ["--scorers"] + body.scorers
         if body.rescore:
@@ -278,6 +289,14 @@ def create_app(
     ) -> list[dict]:
         return registry.get_review_variants(limit=limit)
 
+    @app.get("/api/terrain-grid")
+    def terrain_grid(
+        elevation: Annotated[str, Query(pattern=r"^(lowland|highland|alpine)$")] = "lowland",
+    ) -> dict:
+        """Biome grid cells for one elevation tier, with best variant per cell."""
+        cells = registry.get_terrain_grid(elevation)
+        return {"cells": cells}
+
     @app.get("/api/theater")
     def theater_variants(
         mode: Annotated[str, Query(pattern=r"^(all|review)$")] = "all",
@@ -329,10 +348,39 @@ def create_app(
     def get_runs() -> list[dict]:
         return registry.get_runs()
 
+    # ── Analytics + Seed pool ─────────────────────────────────────────────
+
+    @app.get("/api/analytics/quality")
+    def quality_analytics(
+        category: Annotated[str | None, Query()] = None,
+        scorer: Annotated[str | None, Query()] = None,
+    ) -> dict:
+        """Quality dimension averages and gate failure rates across scored variants."""
+        return registry.get_quality_analytics(category=category, scorer=scorer)
+
+    @app.get("/api/seeds")
+    def list_seeds(
+        category: Annotated[str | None, Query()] = None,
+        limit: Annotated[int, Query(ge=1, le=200)] = 50,
+    ) -> list[dict]:
+        """Top seeds from the pool for a category."""
+        return registry.get_seed_pool_report(category=category, limit=limit)
+
+    @app.post("/api/seeds/pin")
+    def pin_seed(body: PinSeedRequest) -> dict:
+        """Manually pin a seed to the pool with max quality (user override)."""
+        registry.pin_seed(
+            seed=body.seed,
+            category=body.category,
+            entity_id=body.entity_id,
+            variant_id=body.variant_id,
+        )
+        return {"status": "pinned", "seed": body.seed, "category": body.category}
+
     # ── Generation trigger ────────────────────────────────────────────────
 
     @app.post("/api/generate")
-    def trigger_generate(body: GenerateRequest) -> dict:
+    async def trigger_generate(body: GenerateRequest) -> dict:
         from engine.generator import SpriteGenerator
 
         config = json.loads((TOOL_DIR / "sprite-config.json").read_text())
@@ -350,7 +398,7 @@ def create_app(
             return {"submitted": 0, "message": "No sprites in 'needed' status"}
 
         sprite_ids = [s["id"] for s in sprites]
-        submitted = gen.generate_sprites(
+        submitted = await gen.submit_batch(
             sprite_ids=sprite_ids,
             variants_per=body.variants,
             priority=body.priority,
diff --git a/tools/sprite-generation/spritegen.db b/tools/sprite-generation/spritegen.db
index f5efd1c5..261ff0da 100644
Binary files a/tools/sprite-generation/spritegen.db and b/tools/sprite-generation/spritegen.db differ
diff --git a/tools/sprite-generation/spritegen.db-shm b/tools/sprite-generation/spritegen.db-shm
index 2e84b5a4..4a838637 100644
Binary files a/tools/sprite-generation/spritegen.db-shm and b/tools/sprite-generation/spritegen.db-shm differ
diff --git a/tools/sprite-generation/spritegen.db-wal b/tools/sprite-generation/spritegen.db-wal
index 220a5576..9c5d5006 100644
Binary files a/tools/sprite-generation/spritegen.db-wal and b/tools/sprite-generation/spritegen.db-wal differ