diff --git a/apps/web/.vercelignore b/apps/web/.vercelignore
index 37cddb8..2780a99 100644
--- a/apps/web/.vercelignore
+++ b/apps/web/.vercelignore
@@ -17,5 +17,9 @@ coverage/
 # Git (Vercel prefers no git dir for CLI deploys)
 .git/
 
+# Scripts and task files (build-time only)
+scripts/
+tasks/
+
 # OS files
 .DS_Store
diff --git a/apps/web/scripts/fill-training-dataset.ts b/apps/web/scripts/fill-training-dataset.ts
index 8757455..9db9b4e 100644
--- a/apps/web/scripts/fill-training-dataset.ts
+++ b/apps/web/scripts/fill-training-dataset.ts
@@ -59,7 +59,7 @@ const TARGET_HEALTHY = 400;
  * Each disease is I/O-bound (HTTP requests), so high concurrency is safe.
  * The global DDG rate limiter prevents us from overwhelming DuckDuckGo.
  */
-const DISEASE_CONCURRENCY = 30;
+const DISEASE_CONCURRENCY = 60;
 
 /**
  * Max DDG requests per second (shared across all concurrent diseases).
@@ -68,10 +68,10 @@ const DISEASE_CONCURRENCY = 30;
  * parallel pages = 9 parallel DDG requests per disease at peak.
  * The rate limiter serializes this so we don't get banned.
  */
-const DDG_RATE_LIMIT_RPS = 15;
+const DDG_RATE_LIMIT_RPS = 3;
 
 /** Max concurrent image downloads per disease */
-const CONCURRENT_DOWNLOADS = 30;
+const CONCURRENT_DOWNLOADS = 3;
 
 /** Minimum image size in bytes to accept */
 const MIN_IMAGE_SIZE = 10_000; // 10KB
@@ -84,7 +84,7 @@ const ALLOWED_EXTENSIONS = [".jpg", ".jpeg", ".png", ".webp"];
 
 /** User agent for requests */
 const UA =
-  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36";
+  "Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/604.1";
 
 /** Healthy class directory name */
 const HEALTHY_CLASS = "healthy";
diff --git a/apps/web/src/__tests__/diseases.test.ts b/apps/web/src/__tests__/diseases.test.ts
index 5237115..daeda4a 100644
--- a/apps/web/src/__tests__/diseases.test.ts
+++ b/apps/web/src/__tests__/diseases.test.ts
@@ -1,20 +1,101 @@
-import { describe, it, expect } from "vitest";
+/**
+ * Data integrity tests for the plant disease knowledge base.
+ *
+ * These tests validate the seed data directly from the JSON source files.
+ * They ensure every plant and disease entry meets minimum quality standards:
+ * required fields, valid enum values, minimum content counts, and
+ * valid cross-references between plants, diseases, and lookalike IDs.
+ *
+ * The JSON seed data is what populates the Turso/libSQL database.
+ */
 
-import {
-  getPlantById,
-  getDiseaseById,
-  getDiseasesByPlantId,
-  getPlantWithDiseases,
-  getDiseaseWithPlant,
-  getLookalikeDiseases,
-  searchPlants,
-  searchDiseases,
-  listPlants,
-  listDiseases,
-  validateKnowledgeBase,
-  plants,
-  diseases,
-} from "@/lib/api/diseases";
+import { describe, it, expect } from "vitest";
+import type { CausalAgentType, Disease, Plant, Severity, Prevalence } from "@/lib/types";
+
+// Import seed data directly for validation
+import rawPlants from "@/data/plants.json";
+import rawDiseases from "@/data/diseases.json";
+
+const plants = rawPlants as Plant[];
+const diseases = rawDiseases as Disease[];
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+function validateKnowledgeBase(): string[] {
+  const errors: string[] = [];
+  const validCausalAgentTypes: CausalAgentType[] = [
+    "fungal",
+    "bacterial",
+    "viral",
+    "environmental",
+  ];
+  const validSeverities: Severity[] = ["low", "moderate", "high", "critical"];
+
+  const plantIds = new Set(plants.map((p) => p.id));
+  const diseaseIds = new Set(diseases.map((d) => d.id));
+
+  // Duplicate check
+  const seenPlantIds = new Set<string>();
+  for (const plant of plants) {
+    if (seenPlantIds.has(plant.id)) {
+      errors.push(`Duplicate plant ID: ${plant.id}`);
+    }
+    seenPlantIds.add(plant.id);
+  }
+
+  const seenDiseaseIds = new Set<string>();
+  for (const disease of diseases) {
+    if (seenDiseaseIds.has(disease.id)) {
+      errors.push(`Duplicate disease ID: ${disease.id}`);
+    }
+    seenDiseaseIds.add(disease.id);
+  }
+
+  for (const d of diseases) {
+    if (!plantIds.has(d.plantId)) {
+      errors.push(`Disease "${d.id}" references unknown plant ID: ${d.plantId}`);
+    }
+    if (!validCausalAgentTypes.includes(d.causalAgentType)) {
+      errors.push(`Disease "${d.id}" has invalid causalAgentType: ${d.causalAgentType}`);
+    }
+    if (!validSeverities.includes(d.severity)) {
+      errors.push(`Disease "${d.id}" has invalid severity: ${d.severity}`);
+    }
+    if (d.symptoms.length < 3) {
+      errors.push(`Disease "${d.id}" has fewer than 3 symptoms (${d.symptoms.length})`);
+    }
+    if (d.causes.length < 2) {
+      errors.push(`Disease "${d.id}" has fewer than 2 causes (${d.causes.length})`);
+    }
+    if (d.treatment.length < 3) {
+      errors.push(`Disease "${d.id}" has fewer than 3 treatment steps (${d.treatment.length})`);
+    }
+    if (d.prevention.length < 2) {
+      errors.push(`Disease "${d.id}" has fewer than 2 prevention tips (${d.prevention.length})`);
+    }
+    for (const lookalikeId of d.lookalikeDiseaseIds) {
+      if (!diseaseIds.has(lookalikeId)) {
+        errors.push(`Disease "${d.id}" references unknown lookalike: ${lookalikeId}`);
+      }
+    }
+  }
+
+  // Bidirectionality check
+  for (const d of diseases) {
+    for (const lookalikeId of d.lookalikeDiseaseIds) {
+      const lookalike = diseases.find((ld) => ld.id === lookalikeId);
+      if (lookalike && !lookalike.lookalikeDiseaseIds.includes(d.id)) {
+        errors.push(
+          `Lookalike reference not bidirectional: "${d.id}" references "${lookalikeId}" but not vice versa`,
+        );
+      }
+    }
+  }
+
+  return errors;
+}
+
+// ─── Tests ───────────────────────────────────────────────────────────────────
 
 describe("Knowledge Base Data", () => {
   it("has ≥20 plants", () => {
@@ -31,305 +112,6 @@ describe("Knowledge Base Data", () => {
   });
 });
 
-describe("getPlantById", () => {
-  it("returns plant for known ID", () => {
-    const plant = getPlantById("tomato");
-    expect(plant).toBeDefined();
-    expect(plant!.commonName).toBe("Tomato");
-    expect(plant!.scientificName).toBe("Solanum lycopersicum");
-  });
-
-  it("returns undefined for unknown ID", () => {
-    expect(getPlantById("nonexistent")).toBeUndefined();
-  });
-
-  it("is case-insensitive", () => {
-    const plant = getPlantById("TOMATO");
-    expect(plant).toBeDefined();
-    expect(plant!.commonName).toBe("Tomato");
-  });
-});
-
-describe("getDiseaseById", () => {
-  it("returns disease for known ID", () => {
-    const disease = getDiseaseById("early-blight");
-    expect(disease).toBeDefined();
-    expect(disease!.name).toBe("Early Blight");
-    expect(disease!.plantId).toBe("tomato");
-  });
-
-  it("returns undefined for unknown ID", () => {
-    expect(getDiseaseById("nonexistent")).toBeUndefined();
-  });
-});
-
-describe("getDiseasesByPlantId", () => {
-  it("returns diseases for tomato", () => {
-    const diseases = getDiseasesByPlantId("tomato");
-    expect(diseases.length).toBeGreaterThanOrEqual(3);
-    expect(diseases.every((d) => d.plantId === "tomato")).toBe(true);
-  });
-
-  it("returns empty array for plant with no diseases", () => {
-    const diseases = getDiseasesByPlantId("nonexistent");
-    expect(diseases).toEqual([]);
-  });
-});
-
-describe("getPlantWithDiseases", () => {
-  it("returns plant with diseases for known ID", () => {
-    const result = getPlantWithDiseases("tomato");
-    expect(result).toBeDefined();
-    expect(result!.plant.id).toBe("tomato");
-    expect(result!.diseases.length).toBeGreaterThanOrEqual(3);
-  });
-
-  it("returns undefined for unknown ID", () => {
-    expect(getPlantWithDiseases("nonexistent")).toBeUndefined();
-  });
-});
-
-describe("getDiseaseWithPlant", () => {
-  it("returns disease with plant for known ID", () => {
-    const result = getDiseaseWithPlant("early-blight");
-    expect(result).toBeDefined();
-    expect(result!.disease.id).toBe("early-blight");
-    expect(result!.plant.id).toBe("tomato");
-  });
-
-  it("returns undefined for unknown ID", () => {
-    expect(getDiseaseWithPlant("nonexistent")).toBeUndefined();
-  });
-});
-
-describe("getLookalikeDiseases", () => {
-  it("returns lookalike diseases for early blight", () => {
-    const lookalikes = getLookalikeDiseases("early-blight");
-    expect(lookalikes.length).toBeGreaterThan(0);
-    // Early blight should reference septoria-leaf-spot and late-blight
-    const lookalikeIds = lookalikes.map((d) => d.id);
-    expect(lookalikeIds).toContain("septoria-leaf-spot");
-    expect(lookalikeIds).toContain("late-blight");
-  });
-
-  it("returns empty array for disease with no lookalikes", () => {
-    const lookalikes = getLookalikeDiseases("tomato-powdery-mildew");
-    expect(lookalikes).toEqual([]);
-  });
-});
-
-describe("searchPlants", () => {
-  it("returns all plants for empty search", () => {
-    const results = searchPlants("");
-    expect(results).toEqual(plants);
-  });
-
-  it("finds tomato by common name", () => {
-    const results = searchPlants("tomato");
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.some((p) => p.id === "tomato")).toBe(true);
-  });
-
-  it("finds plants by scientific name", () => {
-    const results = searchPlants("Solanum");
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.every((p) => p.scientificName.includes("Solanum"))).toBe(true);
-  });
-
-  it("finds plants by family", () => {
-    const results = searchPlants("Lamiaceae");
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.every((p) => p.family === "Lamiaceae")).toBe(true);
-  });
-
-  it("finds plants by category", () => {
-    const results = searchPlants("houseplant");
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.every((p) => p.category === "houseplant")).toBe(true);
-  });
-
-  it("returns empty array for no matches", () => {
-    const results = searchPlants("xyznonexistent123");
-    expect(results).toEqual([]);
-  });
-});
-
-describe("searchDiseases", () => {
-  it("returns all diseases for empty search", () => {
-    const results = searchDiseases("");
-    expect(results).toEqual(diseases);
-  });
-
-  it("finds diseases by name", () => {
-    const results = searchDiseases("blight");
-    expect(results.length).toBeGreaterThanOrEqual(2);
-  });
-
-  it("finds diseases by scientific name", () => {
-    const results = searchDiseases("Alternaria");
-    expect(results.length).toBeGreaterThan(0);
-  });
-
-  it("finds diseases by description content", () => {
-    const results = searchDiseases("calcium");
-    expect(results.length).toBeGreaterThan(0);
-  });
-
-  it("finds diseases by symptom text", () => {
-    const results = searchDiseases("powdery");
-    expect(results.length).toBeGreaterThan(0);
-  });
-
-  it("returns empty array for no matches", () => {
-    const results = searchDiseases("xyznonexistent123");
-    expect(results).toEqual([]);
-  });
-});
-
-describe("listPlants", () => {
-  it("returns all plants with no filters", () => {
-    const results = listPlants();
-    expect(results).toEqual(plants);
-  });
-
-  it("filters by category", () => {
-    const results = listPlants({ category: "vegetable" });
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.every((p) => p.category === "vegetable")).toBe(true);
-  });
-
-  it("combines search and category filter", () => {
-    const results = listPlants({ search: "leaf", category: "houseplant" });
-    expect(results.every((p) => p.category === "houseplant")).toBe(true);
-  });
-});
-
-describe("listDiseases", () => {
-  it("returns all diseases with no filters", () => {
-    const results = listDiseases();
-    expect(results).toEqual(diseases);
-  });
-
-  it("filters by plantId", () => {
-    const results = listDiseases({ plantId: "tomato" });
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.every((d) => d.plantId === "tomato")).toBe(true);
-  });
-
-  it("filters by causalAgentType", () => {
-    const results = listDiseases({ causalAgentType: "fungal" });
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.every((d) => d.causalAgentType === "fungal")).toBe(true);
-  });
-
-  it("filters by severity", () => {
-    const results = listDiseases({ severity: "critical" });
-    expect(results.length).toBeGreaterThan(0);
-    expect(results.every((d) => d.severity === "critical")).toBe(true);
-  });
-
-  it("combines plantId and search filters", () => {
-    const results = listDiseases({ plantId: "tomato", search: "blight" });
-    expect(results.every((d) => d.plantId === "tomato")).toBe(true);
-    expect(results.every((d) => d.name.toLowerCase().includes("blight") || d.description.toLowerCase().includes("blight") || d.symptoms.some((s) => s.toLowerCase().includes("blight")))).toBe(true);
-  });
-});
-
-describe("validateKnowledgeBase", () => {
-  it("returns no errors for valid data", () => {
-    const errors = validateKnowledgeBase();
-    expect(errors).toEqual([]);
-  });
-
-  it("detects invalid plant references", () => {
-    // Temporarily modify a disease to have invalid plantId
-    const original = diseases[0].plantId;
-    diseases[0].plantId = "nonexistent-plant";
-    const errors = validateKnowledgeBase();
-    diseases[0].plantId = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("nonexistent-plant"))).toBe(true);
-  });
-
-  it("detects invalid causalAgentType", () => {
-    const original = diseases[0].causalAgentType;
-    (diseases[0] as any).causalAgentType = "invalid-type";
-    const errors = validateKnowledgeBase();
-    diseases[0].causalAgentType = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("invalid-type"))).toBe(true);
-  });
-
-  it("detects invalid severity", () => {
-    const original = diseases[0].severity;
-    (diseases[0] as any).severity = "invalid-severity";
-    const errors = validateKnowledgeBase();
-    diseases[0].severity = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("invalid-severity"))).toBe(true);
-  });
-
-  it("detects too few symptoms", () => {
-    const original = [...diseases[0].symptoms];
-    diseases[0].symptoms = ["only one"];
-    const errors = validateKnowledgeBase();
-    diseases[0].symptoms = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("fewer than 3 symptoms"))).toBe(true);
-  });
-
-  it("detects too few causes", () => {
-    const original = [...diseases[0].causes];
-    diseases[0].causes = ["only one"];
-    const errors = validateKnowledgeBase();
-    diseases[0].causes = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("fewer than 2 causes"))).toBe(true);
-  });
-
-  it("detects too few treatments", () => {
-    const original = [...diseases[0].treatment];
-    diseases[0].treatment = ["one", "two"];
-    const errors = validateKnowledgeBase();
-    diseases[0].treatment = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("fewer than 3 treatment"))).toBe(true);
-  });
-
-  it("detects too few prevention tips", () => {
-    const original = [...diseases[0].prevention];
-    diseases[0].prevention = ["only one"];
-    const errors = validateKnowledgeBase();
-    diseases[0].prevention = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("fewer than 2 prevention"))).toBe(true);
-  });
-
-  it("detects invalid lookalike references", () => {
-    const original = [...diseases[0].lookalikeDiseaseIds];
-    diseases[0].lookalikeDiseaseIds = ["nonexistent-disease"];
-    const errors = validateKnowledgeBase();
-    diseases[0].lookalikeDiseaseIds = original;
-    expect(errors.length).toBeGreaterThan(0);
-    expect(errors.some((e) => e.includes("nonexistent-disease"))).toBe(true);
-  });
-
-  it("detects non-bidirectional lookalike references", () => {
-    // early-blight references septoria-leaf-spot and late-blight
-    // If we remove early-blight from septoria's lookalikes, it should flag
-    const septoria = diseases.find((d) => d.id === "septoria-leaf-spot");
-    if (septoria) {
-      const original = [...septoria.lookalikeDiseaseIds];
-      septoria.lookalikeDiseaseIds = septoria.lookalikeDiseaseIds.filter(
-        (id) => id !== "early-blight"
-      );
-      const errors = validateKnowledgeBase();
-      septoria.lookalikeDiseaseIds = original;
-      expect(errors.some((e) => e.includes("not bidirectional"))).toBe(true);
-    }
-  });
-});
-
 describe("Data quality checks", () => {
   it("every disease has ≥3 symptoms", () => {
     for (const d of diseases) {
@@ -397,4 +179,23 @@ describe("Data quality checks", () => {
     const plantIds = new Set(diseases.map((d) => d.plantId));
     expect(plantIds.size).toBeGreaterThanOrEqual(20);
   });
+
+  it("every disease has valid prevalence enum value", () => {
+    const validPrevalences: Prevalence[] = ["common", "uncommon", "rare", "very_rare"];
+    for (const d of diseases) {
+      if (d.prevalence !== undefined) {
+        expect(validPrevalences).toContain(d.prevalence);
+      }
+    }
+  });
+
+  it("every plant has required fields", () => {
+    for (const p of plants) {
+      expect(p.id).toBeTruthy();
+      expect(p.commonName).toBeTruthy();
+      expect(p.scientificName).toBeTruthy();
+      expect(p.family).toBeTruthy();
+      expect(p.category).toBeTruthy();
+    }
+  });
 });
diff --git a/apps/web/src/app/api/identify/identify.test.ts b/apps/web/src/app/api/identify/identify.test.ts
index 589585a..d74a042 100644
--- a/apps/web/src/app/api/identify/identify.test.ts
+++ b/apps/web/src/app/api/identify/identify.test.ts
@@ -19,7 +19,7 @@
 // @vitest-environment node
 
 import { describe, it, expect, beforeAll } from "vitest";
-import { getDiseaseById } from "@/lib/api/diseases";
+import { getDiseaseById } from "@/lib/api/diseases-db";
 
 const BASE_URL = process.env.TEST_BASE_URL || "http://localhost:3000";
 
@@ -172,7 +172,7 @@ describe("POST /api/identify", () => {
     const { data } = await callIdentify(imageId);
 
     for (const pred of data.predictions) {
-      const disease = getDiseaseById(pred.diseaseId);
+      const disease = await getDiseaseById(pred.diseaseId);
       expect(disease).toBeDefined();
       expect(disease!.id).toBe(pred.diseaseId);
       expect(disease!.name).toBe(pred.disease.name);
@@ -184,7 +184,7 @@ describe("POST /api/identify", () => {
 
     for (let i = 0; i < data.predictions.length - 1; i++) {
       expect(data.predictions[i].confidence.adjusted).toBeGreaterThanOrEqual(
-        data.predictions[i + 1].confidence.adjusted
+        data.predictions[i + 1].confidence.adjusted,
       );
     }
   }, 30000);
@@ -194,7 +194,7 @@ describe("POST /api/identify", () => {
 
     for (const pred of data.predictions) {
       for (const lookalikeId of pred.lookalikes) {
-        const lookalike = getDiseaseById(lookalikeId);
+        const lookalike = await getDiseaseById(lookalikeId);
         expect(lookalike).toBeDefined();
       }
     }
diff --git a/apps/web/src/app/api/identify/route.ts b/apps/web/src/app/api/identify/route.ts
index b16e0f2..52cb204 100644
--- a/apps/web/src/app/api/identify/route.ts
+++ b/apps/web/src/app/api/identify/route.ts
@@ -19,7 +19,7 @@ import { runInference } from "@/lib/ml/inference";
 import { calibrateConfidence } from "@/lib/ml/confidence";
 import { getDiseaseIdForIndex } from "@/lib/ml/labels";
 import { getModel } from "@/lib/ml/model-loader";
-import { getDiseaseById, getPlantById } from "@/lib/api/diseases-db";
+import { getDiseaseById, getPlantById, getLookalikeDiseases } from "@/lib/api/diseases-db";
 import type { IdentifyRequest, IdentifyResponse, PredictionResult } from "@/lib/types";
 
 // ─── Constants ───────────────────────────────────────────────────────────────
@@ -121,7 +121,7 @@ async function preprocessImageBuffer(buffer: Buffer): Promise<Float32Array> {
  * For each prediction:
  * - Look up disease by ID in knowledge base
  * - Calibrate confidence score
- * - Include lookalike disease cross-references
+ * - Include lookalike disease cross-references (IDs and full objects)
  *
  * @param topPredictions - Top-K raw predictions from inference
  * @returns Enriched prediction results
@@ -149,8 +149,10 @@ async function enrichPredictions(
     // Calibrate confidence
     const confidence = calibrateConfidence(pred.probability);
 
-    // Get lookalike diseases
+    // Pre-resolve lookalike disease objects server-side so the client
+    // doesn't need sync access to JSON files
     const lookalikes = disease.lookalikeDiseaseIds;
+    const lookalikeDiseases = await getLookalikeDiseases(diseaseId);
 
     // Look up the plant for client convenience
     const plant = await getPlantById(disease.plantId).catch(() => null);
@@ -160,6 +162,7 @@ async function enrichPredictions(
       disease,
       confidence,
       lookalikes,
+      lookalikeDiseases,
       plant: plant ?? null,
     });
   }
diff --git a/apps/web/src/components/DiseaseCard.tsx b/apps/web/src/components/DiseaseCard.tsx
index d6cf40c..41231a7 100644
--- a/apps/web/src/components/DiseaseCard.tsx
+++ b/apps/web/src/components/DiseaseCard.tsx
@@ -7,7 +7,6 @@ import SymptomChecker from "@/components/SymptomChecker";
 import TreatmentTimeline, { treatmentStepsWithUrgency } from "@/components/TreatmentTimeline";
 import LookalikeWarning from "@/components/LookalikeWarning";
 import FlagButton from "@/components/FlagButton";
-import { getLookalikeDiseases } from "@/lib/api/diseases";
 
 /**
  * Individual disease result card with expandable sections.
@@ -31,9 +30,9 @@ export default function DiseaseCard({
   const [expanded, setExpanded] = useState(isPrimary);
   const [feedback, setFeedback] = useState<"yes" | "no" | null>(null);
 
-  const { disease, confidence } = prediction;
+  const { disease, confidence, lookalikeDiseases } = prediction;
   const colors = getConfidenceColors(confidence.label);
-  const lookalikes = getLookalikeDiseases(disease.id);
+  const lookalikes = lookalikeDiseases ?? [];
 
   const toggleExpand = useCallback(() => {
     setExpanded((e) => !e);
diff --git a/apps/web/src/lib/api/diseases.ts b/apps/web/src/lib/api/diseases.ts
deleted file mode 100644
index b832e68..0000000
--- a/apps/web/src/lib/api/diseases.ts
+++ /dev/null
@@ -1,315 +0,0 @@
-/**
- * Typed helpers to query the plant disease knowledge base.
- * All functions operate on the JSON seed data files.
- */
-
-import type {
-  CausalAgentType,
-  Disease,
-  DiseaseListParams,
-  DiseaseWithPlant,
-  Plant,
-  PlantListParams,
-  PlantWithDiseases,
-  Severity,
-} from "@/lib/types";
-
-import rawPlants from "@/data/plants.json";
-import rawDiseases from "@/data/diseases.json";
-
-// Cast JSON imports to typed arrays
-const plants: Plant[] = rawPlants as Plant[];
-const diseases: Disease[] = rawDiseases as Disease[];
-
-// Re-export raw data for direct access if needed
-export { plants, diseases };
-
-// Lookup maps for O(1) access
-const plantMap = new Map(plants.map((p) => [p.id, p]));
-const diseaseMap = new Map(diseases.map((d) => [d.id, d]));
-
-/**
- * Get a plant by its ID.
- * @returns The plant or undefined if not found.
- */
-export function getPlantById(id: string): Plant | undefined {
-  return plantMap.get(id.toLowerCase());
-}
-
-/**
- * Get a disease by its ID.
- * @returns The disease or undefined if not found.
- */
-export function getDiseaseById(id: string): Disease | undefined {
-  return diseaseMap.get(id.toLowerCase());
-}
-
-/**
- * Get all diseases for a specific plant.
- * @returns Array of diseases for the plant.
- */
-export function getDiseasesByPlantId(plantId: string): Disease[] {
-  return diseases.filter(
-    (d) => d.plantId.toLowerCase() === plantId.toLowerCase()
-  );
-}
-
-/**
- * Get a plant with all its associated diseases.
- * @returns PlantWithDiseases or undefined if plant not found.
- */
-export function getPlantWithDiseases(
-  plantId: string
-): PlantWithDiseases | undefined {
-  const plant = getPlantById(plantId);
-  if (!plant) return undefined;
-  return {
-    plant,
-    diseases: getDiseasesByPlantId(plantId),
-  };
-}
-
-/**
- * Get a disease with its associated plant.
- * @returns DiseaseWithPlant or undefined if disease not found.
- */
-export function getDiseaseWithPlant(
-  diseaseId: string
-): DiseaseWithPlant | undefined {
-  const disease = getDiseaseById(diseaseId);
-  if (!disease) return undefined;
-  const plant = getPlantById(disease.plantId);
-  if (!plant) return undefined;
-  return { disease, plant };
-}
-
-/**
- * Resolve lookalike disease IDs to full disease objects.
- * @returns Array of lookalike diseases.
- */
-export function getLookalikeDiseases(diseaseId: string): Disease[] {
-  const disease = getDiseaseById(diseaseId);
-  if (!disease || !disease.lookalikeDiseaseIds.length) return [];
-  return disease.lookalikeDiseaseIds
-    .map((id) => getDiseaseById(id))
-    .filter((d): d is Disease => d !== undefined);
-}
-
-/**
- * Search plants by term (matches common name, scientific name, family, category).
- * @param term - Search term (case-insensitive).
- * @returns Matching plants.
- */
-export function searchPlants(term: string): Plant[] {
-  const lower = term.toLowerCase().trim();
-  if (!lower) return plants;
-  return plants.filter(
-    (p) =>
-      p.commonName.toLowerCase().includes(lower) ||
-      p.scientificName.toLowerCase().includes(lower) ||
-      p.family.toLowerCase().includes(lower) ||
-      p.category.toLowerCase().includes(lower)
-  );
-}
-
-/**
- * Search diseases by term (matches name, scientific name, description, symptoms).
- * @param term - Search term (case-insensitive).
- * @returns Matching diseases.
- */
-export function searchDiseases(term: string): Disease[] {
-  const lower = term.toLowerCase().trim();
-  if (!lower) return diseases;
-  return diseases.filter(
-    (d) =>
-      d.name.toLowerCase().includes(lower) ||
-      d.scientificName.toLowerCase().includes(lower) ||
-      d.description.toLowerCase().includes(lower) ||
-      d.symptoms.some((s) => s.toLowerCase().includes(lower))
-  );
-}
-
-/**
- * List plants with optional search and category filters.
- */
-export function listPlants(params: PlantListParams = {}): Plant[] {
-  let result = plants;
-  if (params.category) {
-    result = result.filter(
-      (p) => p.category === params.category
-    );
-  }
-  if (params.search) {
-    const lower = params.search.toLowerCase().trim();
-    result = result.filter(
-      (p) =>
-        p.commonName.toLowerCase().includes(lower) ||
-        p.scientificName.toLowerCase().includes(lower) ||
-        p.family.toLowerCase().includes(lower) ||
-        p.category.toLowerCase().includes(lower)
-    );
-  }
-  return result;
-}
-
-/**
- * List diseases with optional filters.
- */
-export function listDiseases(params: DiseaseListParams = {}): Disease[] {
-  let result = diseases;
-  if (params.plantId) {
-    result = result.filter(
-      (d) => d.plantId.toLowerCase() === params.plantId!.toLowerCase()
-    );
-  }
-  if (params.causalAgentType) {
-    result = result.filter(
-      (d) => d.causalAgentType === params.causalAgentType
-    );
-  }
-  if (params.severity) {
-    result = result.filter((d) => d.severity === params.severity);
-  }
-  if (params.search) {
-    const lower = params.search.toLowerCase().trim();
-    result = result.filter(
-      (d) =>
-        d.name.toLowerCase().includes(lower) ||
-        d.scientificName.toLowerCase().includes(lower) ||
-        d.description.toLowerCase().includes(lower) ||
-        d.symptoms.some((s) => s.toLowerCase().includes(lower))
-    );
-  }
-  return result;
-}
-
-/**
- * Get all unique plant IDs that have diseases.
- */
-export function getPlantIdsWithDiseases(): string[] {
-  return [...new Set(diseases.map((d) => d.plantId))];
-}
-
-/**
- * Get all unique disease IDs referenced as lookalikes.
- */
-export function getReferencedLookalikeIds(): Set<string> {
-  const ids = new Set<string>();
-  for (const disease of diseases) {
-    for (const lookalikeId of disease.lookalikeDiseaseIds) {
-      ids.add(lookalikeId);
-    }
-  }
-  return ids;
-}
-
-/**
- * Validate knowledge base data integrity.
- * @returns Array of validation errors (empty = valid).
- */
-export function validateKnowledgeBase(): string[] {
-  const errors: string[] = [];
-  const validCausalAgentTypes: CausalAgentType[] = [
-    "fungal",
-    "bacterial",
-    "viral",
-    "environmental",
-  ];
-  const validSeverities: Severity[] = ["low", "moderate", "high", "critical"];
-
-  // Check all plant IDs are unique
-  const plantIds = new Set<string>();
-  for (const plant of plants) {
-    if (plantIds.has(plant.id)) {
-      errors.push(`Duplicate plant ID: ${plant.id}`);
-    }
-    plantIds.add(plant.id);
-  }
-
-  // Check all disease IDs are unique
-  const diseaseIds = new Set<string>();
-  for (const disease of diseases) {
-    if (diseaseIds.has(disease.id)) {
-      errors.push(`Duplicate disease ID: ${disease.id}`);
-    }
-    diseaseIds.add(disease.id);
-  }
-
-  // Check each disease
-  for (const disease of diseases) {
-    // Valid plant reference
-    if (!plantIds.has(disease.plantId)) {
-      errors.push(
-        `Disease "${disease.id}" references unknown plant ID: ${disease.plantId}`
-      );
-    }
-
-    // Valid causal agent type
-    if (!validCausalAgentTypes.includes(disease.causalAgentType)) {
-      errors.push(
-        `Disease "${disease.id}" has invalid causalAgentType: ${disease.causalAgentType}`
-      );
-    }
-
-    // Valid severity
-    if (!validSeverities.includes(disease.severity)) {
-      errors.push(
-        `Disease "${disease.id}" has invalid severity: ${disease.severity}`
-      );
-    }
-
-    // Minimum symptom count
-    if (disease.symptoms.length < 3) {
-      errors.push(
-        `Disease "${disease.id}" has fewer than 3 symptoms (${disease.symptoms.length})`
-      );
-    }
-
-    // Minimum cause count
-    if (disease.causes.length < 2) {
-      errors.push(
-        `Disease "${disease.id}" has fewer than 2 causes (${disease.causes.length})`
-      );
-    }
-
-    // Minimum treatment count
-    if (disease.treatment.length < 3) {
-      errors.push(
-        `Disease "${disease.id}" has fewer than 3 treatment steps (${disease.treatment.length})`
-      );
-    }
-
-    // Minimum prevention count
-    if (disease.prevention.length < 2) {
-      errors.push(
-        `Disease "${disease.id}" has fewer than 2 prevention tips (${disease.prevention.length})`
-      );
-    }
-
-    // Valid lookalike references
-    for (const lookalikeId of disease.lookalikeDiseaseIds) {
-      if (!diseaseIds.has(lookalikeId)) {
-        errors.push(
-          `Disease "${disease.id}" references unknown lookalike: ${lookalikeId}`
-        );
-      }
-    }
-  }
-
-  // Check lookalike bidirectionality (optional warning, not error)
-  for (const disease of diseases) {
-    for (const lookalikeId of disease.lookalikeDiseaseIds) {
-      const lookalike = getDiseaseById(lookalikeId);
-      if (
-        lookalike &&
-        !lookalike.lookalikeDiseaseIds.includes(disease.id)
-      ) {
-        errors.push(
-          `Lookalike reference not bidirectional: "${disease.id}" references "${lookalikeId}" but not vice versa`
-        );
-      }
-    }
-  }
-
-  return errors;
-}
diff --git a/apps/web/src/lib/types.ts b/apps/web/src/lib/types.ts
index 3a4d3a5..329e81d 100644
--- a/apps/web/src/lib/types.ts
+++ b/apps/web/src/lib/types.ts
@@ -150,6 +150,8 @@ export interface PredictionResult {
   confidence: ConfidenceResult;
   /** IDs of lookalike diseases that could be confused with this one */
   lookalikes: string[];
+  /** Full disease objects for lookalikes, pre-resolved server-side */
+  lookalikeDiseases: Disease[];
   /** The plant this disease affects (included for client convenience) */
   plant: Plant | null;
 }
diff --git a/apps/web/tsconfig.json b/apps/web/tsconfig.json
index b5da6f7..5bf2b73 100644
--- a/apps/web/tsconfig.json
+++ b/apps/web/tsconfig.json
@@ -31,5 +31,14 @@
     ".next/dev/types/**/*.ts",
     "**/*.mts"
   ],
-  "exclude": ["node_modules", "**/*.test.ts", "**/*.test.tsx", "src/test/**"]
+  "exclude": [
+    "node_modules",
+    "scripts",
+    "tasks",
+    "coverage",
+    "data",
+    "**/*.test.ts",
+    "**/*.test.tsx",
+    "src/test/**"
+  ]
 }