Add per-round assignment constraints (min/max per judge)

- Add minAssignmentsPerJuror and maxAssignmentsPerJuror fields to Round model
- Update assignment router:
  - Calculate effective max from user override or round default
  - Add forceOverride parameter for manual assignment beyond limits
  - Update getSuggestions to use round constraints with min target bonus
  - Update getAISuggestions to pass constraints to AI service
- Update AI assignment service:
  - Add minAssignmentsPerJuror to constraints interface
  - Update fallback algorithm with under-min bonus scoring
  - New score weights: 50% expertise, 30% load, 20% under-min bonus
- Update round router:
  - Add new constraint fields to create/update schemas
  - Add validation for min <= max constraint
- Update admin UI:
  - Add min/max constraint fields to round edit page
  - Remove hardcoded maxPerJuror from assignments page
- Add migration files for production deployment:
  - User.bio field for judge/mentor profiles
  - Round assignment constraint fields

Constraint hierarchy:
1. User.maxAssignments (if set) overrides round default
2. Round.maxAssignmentsPerJuror is the default cap
3. Admin can force-override any limit with confirmation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

prisma/migrations/20260204140000_add_user_bio/migration.sql

@@ -0,0 +1,3 @@
+-- Add bio field to User model for judge/mentor profile descriptions
+ALTER TABLE "User" ADD COLUMN IF NOT EXISTS "bio" TEXT;
+

prisma/migrations/20260204150000_add_assignment_constraints/migration.sql

@@ -0,0 +1,4 @@
+-- Add assignment constraint fields to Round model
+ALTER TABLE "Round" ADD COLUMN IF NOT EXISTS "minAssignmentsPerJuror" INTEGER NOT NULL DEFAULT 5;
+ALTER TABLE "Round" ADD COLUMN IF NOT EXISTS "maxAssignmentsPerJuror" INTEGER NOT NULL DEFAULT 20;
+

prisma/schema.prisma

@@ -357,6 +357,8 @@ model Round {
 
   // Configuration
   requiredReviews          Int   @default(3)  // Min evaluations per project
+  minAssignmentsPerJuror   Int   @default(5)  // Target minimum projects per judge
+  maxAssignmentsPerJuror   Int   @default(20) // Max projects per judge in this round
   settingsJson             Json? @db.JsonB    // Grace periods, visibility rules, etc.
 
   createdAt DateTime @default(now())

src/app/(admin)/admin/rounds/[id]/assignments/page.tsx

@@ -81,7 +81,7 @@ function AssignmentManagementContent({ roundId }: { roundId: string }) {
   const { data: assignments, isLoading: loadingAssignments } = trpc.assignment.listByRound.useQuery({ roundId })
   const { data: stats, isLoading: loadingStats } = trpc.assignment.getStats.useQuery({ roundId })
   const { data: suggestions, isLoading: loadingSuggestions, refetch: refetchSuggestions } = trpc.assignment.getSuggestions.useQuery(
-    { roundId, maxPerJuror: 10, minPerProject: 3 },
+    { roundId },
     { enabled: !!round }
   )
 

src/app/(admin)/admin/rounds/[id]/edit/page.tsx

@@ -59,6 +59,8 @@ const updateRoundSchema = z
   .object({
     name: z.string().min(1, 'Name is required').max(255),
     requiredReviews: z.number().int().min(1).max(10),
+    minAssignmentsPerJuror: z.number().int().min(1).max(50),
+    maxAssignmentsPerJuror: z.number().int().min(1).max(100),
     votingStartAt: z.date().nullable().optional(),
     votingEndAt: z.date().nullable().optional(),
   })
@@ -74,6 +76,13 @@ const updateRoundSchema = z
       path: ['votingEndAt'],
     }
   )
+  .refine(
+    (data) => data.minAssignmentsPerJuror <= data.maxAssignmentsPerJuror,
+    {
+      message: 'Min must be less than or equal to max',
+      path: ['minAssignmentsPerJuror'],
+    }
+  )
 
 type UpdateRoundForm = z.infer<typeof updateRoundSchema>
 
@@ -121,6 +130,8 @@ function EditRoundContent({ roundId }: { roundId: string }) {
     defaultValues: {
       name: '',
       requiredReviews: 3,
+      minAssignmentsPerJuror: 5,
+      maxAssignmentsPerJuror: 20,
       votingStartAt: null,
       votingEndAt: null,
     },
@@ -132,6 +143,8 @@ function EditRoundContent({ roundId }: { roundId: string }) {
       form.reset({
         name: round.name,
         requiredReviews: round.requiredReviews,
+        minAssignmentsPerJuror: round.minAssignmentsPerJuror,
+        maxAssignmentsPerJuror: round.maxAssignmentsPerJuror,
         votingStartAt: round.votingStartAt ? new Date(round.votingStartAt) : null,
         votingEndAt: round.votingEndAt ? new Date(round.votingEndAt) : null,
       })
@@ -161,6 +174,8 @@ function EditRoundContent({ roundId }: { roundId: string }) {
       id: roundId,
       name: data.name,
       requiredReviews: data.requiredReviews,
+      minAssignmentsPerJuror: data.minAssignmentsPerJuror,
+      maxAssignmentsPerJuror: data.maxAssignmentsPerJuror,
       roundType,
       settingsJson: roundSettings,
       votingStartAt: data.votingStartAt ?? null,
@@ -277,6 +292,58 @@ function EditRoundContent({ roundId }: { roundId: string }) {
                   </FormItem>
                 )}
               />
+
+              <div className="grid gap-4 sm:grid-cols-2">
+                <FormField
+                  control={form.control}
+                  name="minAssignmentsPerJuror"
+                  render={({ field }) => (
+                    <FormItem>
+                      <FormLabel>Min Projects per Judge</FormLabel>
+                      <FormControl>
+                        <Input
+                          type="number"
+                          min={1}
+                          max={50}
+                          {...field}
+                          onChange={(e) =>
+                            field.onChange(parseInt(e.target.value) || 1)
+                          }
+                        />
+                      </FormControl>
+                      <FormDescription>
+                        Target minimum projects each judge should receive
+                      </FormDescription>
+                      <FormMessage />
+                    </FormItem>
+                  )}
+                />
+
+                <FormField
+                  control={form.control}
+                  name="maxAssignmentsPerJuror"
+                  render={({ field }) => (
+                    <FormItem>
+                      <FormLabel>Max Projects per Judge</FormLabel>
+                      <FormControl>
+                        <Input
+                          type="number"
+                          min={1}
+                          max={100}
+                          {...field}
+                          onChange={(e) =>
+                            field.onChange(parseInt(e.target.value) || 1)
+                          }
+                        />
+                      </FormControl>
+                      <FormDescription>
+                        Maximum projects a judge can be assigned
+                      </FormDescription>
+                      <FormMessage />
+                    </FormItem>
+                  )}
+                />
+              </div>
             </CardContent>
           </Card>
 

src/server/routers/assignment.ts

@@ -137,6 +137,7 @@ export const assignmentRouter = router({
         projectId: z.string(),
         roundId: z.string(),
         isRequired: z.boolean().default(true),
+        forceOverride: z.boolean().default(false), // Allow manual override of limits
       })
     )
     .mutation(async ({ ctx, input }) => {
@@ -158,28 +159,41 @@ export const assignmentRouter = router({
         })
       }
 
-      // Check user's assignment limit
-      const user = await ctx.prisma.user.findUniqueOrThrow({
+      // Get round constraints and user limit
+      const [round, user] = await Promise.all([
+        ctx.prisma.round.findUniqueOrThrow({
+          where: { id: input.roundId },
+          select: { maxAssignmentsPerJuror: true },
+        }),
+        ctx.prisma.user.findUniqueOrThrow({
           where: { id: input.userId },
-        select: { maxAssignments: true },
-      })
+          select: { maxAssignments: true, name: true },
+        }),
+      ])
+
+      // Calculate effective max: user override takes precedence if set
+      const effectiveMax = user.maxAssignments ?? round.maxAssignmentsPerJuror
 
-      if (user.maxAssignments !== null) {
       const currentCount = await ctx.prisma.assignment.count({
         where: { userId: input.userId, roundId: input.roundId },
       })
 
-        if (currentCount >= user.maxAssignments) {
+      // Check if at or over limit
+      if (currentCount >= effectiveMax) {
+        if (!input.forceOverride) {
           throw new TRPCError({
             code: 'BAD_REQUEST',
-            message: `User has reached their maximum assignment limit of ${user.maxAssignments}`,
+            message: `${user.name || 'Judge'} has reached their maximum limit of ${effectiveMax} projects. Use manual override to proceed.`,
           })
         }
+        // Log the override in audit
+        console.log(`[Assignment] Manual override: Assigning ${user.name} beyond limit (${currentCount}/${effectiveMax})`)
       }
 
+      const { forceOverride: _override, ...assignmentData } = input
       const assignment = await ctx.prisma.assignment.create({
         data: {
-          ...input,
+          ...assignmentData,
           method: 'MANUAL',
           createdBy: ctx.user.id,
         },
@@ -199,7 +213,7 @@ export const assignmentRouter = router({
       })
 
       // Send notification to the assigned jury member
-      const [project, round] = await Promise.all([
+      const [project, roundInfo] = await Promise.all([
         ctx.prisma.project.findUnique({
           where: { id: input.projectId },
           select: { title: true },
@@ -210,9 +224,9 @@ export const assignmentRouter = router({
         }),
       ])
 
-      if (project && round) {
-        const deadline = round.votingEndAt
-          ? new Date(round.votingEndAt).toLocaleDateString('en-US', {
+      if (project && roundInfo) {
+        const deadline = roundInfo.votingEndAt
+          ? new Date(roundInfo.votingEndAt).toLocaleDateString('en-US', {
               weekday: 'long',
               year: 'numeric',
               month: 'long',
@@ -224,12 +238,12 @@ export const assignmentRouter = router({
           userId: input.userId,
           type: NotificationTypes.ASSIGNED_TO_PROJECT,
           title: 'New Project Assignment',
-          message: `You have been assigned to evaluate "${project.title}" for ${round.name}.`,
+          message: `You have been assigned to evaluate "${project.title}" for ${roundInfo.name}.`,
           linkUrl: `/jury/assignments`,
           linkLabel: 'View Assignment',
           metadata: {
             projectName: project.title,
-            roundName: round.name,
+            roundName: roundInfo.name,
             deadline,
             assignmentId: assignment.id,
           },
@@ -419,11 +433,19 @@ export const assignmentRouter = router({
     .input(
       z.object({
         roundId: z.string(),
-        maxPerJuror: z.number().int().min(1).max(50).default(10),
-        minPerProject: z.number().int().min(1).max(10).default(3),
       })
     )
     .query(async ({ ctx, input }) => {
+      // Get round constraints
+      const round = await ctx.prisma.round.findUniqueOrThrow({
+        where: { id: input.roundId },
+        select: {
+          requiredReviews: true,
+          minAssignmentsPerJuror: true,
+          maxAssignmentsPerJuror: true,
+        },
+      })
+
       // Get all active jury members with their expertise and current load
       const jurors = await ctx.prisma.user.findMany({
         where: { role: 'JURY_MEMBER', status: 'ACTIVE' },
@@ -473,25 +495,25 @@ export const assignmentRouter = router({
 
       for (const project of projects) {
         // Skip if project has enough assignments
-        if (project._count.assignments >= input.minPerProject) continue
+        if (project._count.assignments >= round.requiredReviews) continue
 
-        const neededAssignments = input.minPerProject - project._count.assignments
+        const neededAssignments = round.requiredReviews - project._count.assignments
 
         // Score each juror for this project
         const jurorScores = jurors
           .filter((j) => {
             // Skip if already assigned
             if (assignmentSet.has(`${j.id}-${project.id}`)) return false
-            // Skip if at max capacity
-            const maxAllowed = j.maxAssignments ?? input.maxPerJuror
-            if (j._count.assignments >= maxAllowed) return false
+            // Skip if at max capacity (user override takes precedence)
+            const effectiveMax = j.maxAssignments ?? round.maxAssignmentsPerJuror
+            if (j._count.assignments >= effectiveMax) return false
             return true
           })
           .map((juror) => {
             const reasoning: string[] = []
             let score = 0
 
-            // Expertise match (40% weight)
+            // Expertise match (35% weight)
             const matchingTags = juror.expertiseTags.filter((tag) =>
               project.tags.includes(tag)
             )
@@ -499,17 +521,31 @@ export const assignmentRouter = router({
               matchingTags.length > 0
                 ? matchingTags.length / Math.max(project.tags.length, 1)
                 : 0
-            score += expertiseScore * 40
+            score += expertiseScore * 35
             if (matchingTags.length > 0) {
               reasoning.push(`Expertise match: ${matchingTags.join(', ')}`)
             }
 
-            // Load balancing (25% weight)
-            const maxAllowed = juror.maxAssignments ?? input.maxPerJuror
-            const loadScore = 1 - juror._count.assignments / maxAllowed
-            score += loadScore * 25
+            // Load balancing (20% weight)
+            const effectiveMax = juror.maxAssignments ?? round.maxAssignmentsPerJuror
+            const loadScore = 1 - juror._count.assignments / effectiveMax
+            score += loadScore * 20
+
+            // Under min target bonus (15% weight) - prioritize judges who need more projects
+            const underMinBonus =
+              juror._count.assignments < round.minAssignmentsPerJuror
+                ? (round.minAssignmentsPerJuror - juror._count.assignments) * 3
+                : 0
+            score += Math.min(15, underMinBonus)
+
+            // Build reasoning
+            if (juror._count.assignments < round.minAssignmentsPerJuror) {
               reasoning.push(
-              `Workload: ${juror._count.assignments}/${maxAllowed} assigned`
+                `Under target: ${juror._count.assignments}/${round.minAssignmentsPerJuror} min`
+              )
+            }
+            reasoning.push(
+              `Capacity: ${juror._count.assignments}/${effectiveMax} max`
             )
 
             return {
@@ -546,14 +582,17 @@ export const assignmentRouter = router({
       z.object({
         roundId: z.string(),
         useAI: z.boolean().default(true),
-        maxPerJuror: z.number().int().min(1).max(50).default(10),
       })
     )
     .query(async ({ ctx, input }) => {
-      // Get round info
+      // Get round constraints
       const round = await ctx.prisma.round.findUniqueOrThrow({
         where: { id: input.roundId },
-        select: { requiredReviews: true },
+        select: {
+          requiredReviews: true,
+          minAssignmentsPerJuror: true,
+          maxAssignmentsPerJuror: true,
+        },
       })
 
       // Get all active jury members with their expertise and current load
@@ -594,7 +633,8 @@ export const assignmentRouter = router({
 
       const constraints = {
         requiredReviewsPerProject: round.requiredReviews,
-        maxAssignmentsPerJuror: input.maxPerJuror,
+        minAssignmentsPerJuror: round.minAssignmentsPerJuror,
+        maxAssignmentsPerJuror: round.maxAssignmentsPerJuror,
         existingAssignments: existingAssignments.map((a) => ({
           jurorId: a.userId,
           projectId: a.projectId,

src/server/routers/round.ts

@@ -70,6 +70,8 @@ export const roundRouter = router({
         name: z.string().min(1).max(255),
         roundType: z.enum(['FILTERING', 'EVALUATION', 'LIVE_EVENT']).default('EVALUATION'),
         requiredReviews: z.number().int().min(1).max(10).default(3),
+        minAssignmentsPerJuror: z.number().int().min(1).max(50).default(5),
+        maxAssignmentsPerJuror: z.number().int().min(1).max(100).default(20),
         sortOrder: z.number().int().optional(),
         settingsJson: z.record(z.unknown()).optional(),
         votingStartAt: z.date().optional(),
@@ -78,6 +80,14 @@ export const roundRouter = router({
       })
     )
     .mutation(async ({ ctx, input }) => {
+      // Validate assignment constraints
+      if (input.minAssignmentsPerJuror > input.maxAssignmentsPerJuror) {
+        throw new TRPCError({
+          code: 'BAD_REQUEST',
+          message: 'Min assignments per juror must be less than or equal to max',
+        })
+      }
+
       // Validate dates
       if (input.votingStartAt && input.votingEndAt) {
         if (input.votingEndAt <= input.votingStartAt) {
@@ -154,6 +164,8 @@ export const roundRouter = router({
         slug: z.string().min(1).max(100).regex(/^[a-z0-9-]+$/).optional().nullable(),
         roundType: z.enum(['FILTERING', 'EVALUATION', 'LIVE_EVENT']).optional(),
         requiredReviews: z.number().int().min(1).max(10).optional(),
+        minAssignmentsPerJuror: z.number().int().min(1).max(50).optional(),
+        maxAssignmentsPerJuror: z.number().int().min(1).max(100).optional(),
         submissionDeadline: z.date().optional().nullable(),
         votingStartAt: z.date().optional().nullable(),
         votingEndAt: z.date().optional().nullable(),
@@ -174,6 +186,22 @@ export const roundRouter = router({
         }
       }
 
+      // Validate assignment constraints if either is provided
+      if (data.minAssignmentsPerJuror !== undefined || data.maxAssignmentsPerJuror !== undefined) {
+        const existingRound = await ctx.prisma.round.findUnique({
+          where: { id },
+          select: { minAssignmentsPerJuror: true, maxAssignmentsPerJuror: true, status: true },
+        })
+        const newMin = data.minAssignmentsPerJuror ?? existingRound?.minAssignmentsPerJuror ?? 5
+        const newMax = data.maxAssignmentsPerJuror ?? existingRound?.maxAssignmentsPerJuror ?? 20
+        if (newMin > newMax) {
+          throw new TRPCError({
+            code: 'BAD_REQUEST',
+            message: 'Min assignments per juror must be less than or equal to max',
+          })
+        }
+      }
+
       // Check if we should auto-activate (if voting start is in the past and round is DRAFT)
       const now = new Date()
       let autoActivate = false

src/server/services/ai-assignment.ts

@@ -78,6 +78,7 @@ interface ProjectForAssignment {
 
 interface AssignmentConstraints {
   requiredReviewsPerProject: number
+  minAssignmentsPerJuror?: number
   maxAssignmentsPerJuror?: number
   existingAssignments: Array<{
     jurorId: string
@@ -412,18 +413,22 @@ export function generateFallbackAssignments(
 
         return true
       })
-      .map((juror) => ({
+      .map((juror) => {
+        const currentLoad = jurorAssignments.get(juror.id) || 0
+        const maxLoad = juror.maxAssignments ?? constraints.maxAssignmentsPerJuror ?? 20
+        const minTarget = constraints.minAssignmentsPerJuror ?? 5
+
+        return {
           juror,
           score: calculateExpertiseScore(juror.expertiseTags, project.tags),
-        loadScore: calculateLoadScore(
-          jurorAssignments.get(juror.id) || 0,
-          juror.maxAssignments ?? constraints.maxAssignmentsPerJuror ?? 10
-        ),
-      }))
+          loadScore: calculateLoadScore(currentLoad, maxLoad),
+          underMinBonus: calculateUnderMinBonus(currentLoad, minTarget),
+        }
+      })
       .sort((a, b) => {
-        // Combined score: 60% expertise, 40% load balancing
-        const aTotal = a.score * 0.6 + a.loadScore * 0.4
-        const bTotal = b.score * 0.6 + b.loadScore * 0.4
+        // Combined score: 50% expertise, 30% load balancing, 20% under-min bonus
+        const aTotal = a.score * 0.5 + a.loadScore * 0.3 + a.underMinBonus * 0.2
+        const bTotal = b.score * 0.5 + b.loadScore * 0.3 + b.underMinBonus * 0.2
         return bTotal - aTotal
       })
 
@@ -494,6 +499,16 @@ function calculateLoadScore(currentLoad: number, maxLoad: number): number {
   return Math.max(0, 1 - utilization)
 }
 
+/**
+ * Calculate bonus for jurors under their minimum target
+ * Returns 1.0 if under min, scaled down as approaching min
+ */
+function calculateUnderMinBonus(currentLoad: number, minTarget: number): number {
+  if (currentLoad >= minTarget) return 0
+  // Scale bonus based on how far under min (1.0 at 0 load, decreasing as approaching min)
+  return (minTarget - currentLoad) / minTarget
+}
+
 /**
  * Generate reasoning for fallback assignments
  */