fix(#64): Address PR comments

supabase/migrations/20260110150000_add_pokedex_entries_mapping.sql

@@ -0,0 +1,46 @@
+-- Add pokedex_entries_mapping table to explicitly define which entries belong to each pokedex
+-- This fixes the stats functions ambiguity issue by providing an explicit definition of expected entries
+
+-- Create pokedex_entries_mapping table
+CREATE TABLE pokedex_entries_mapping (
+  id BIGSERIAL PRIMARY KEY,
+  "pokedexId" UUID NOT NULL REFERENCES pokedexes(id) ON DELETE CASCADE,
+  "pokedexEntryId" BIGINT NOT NULL REFERENCES pokedex_entries(id) ON DELETE CASCADE,
+  UNIQUE("pokedexId", "pokedexEntryId")
+);
+
+-- Create indexes for performance
+CREATE INDEX idx_pokedex_entries_mapping_pokedex_id ON pokedex_entries_mapping("pokedexId");
+CREATE INDEX idx_pokedex_entries_mapping_entry_id ON pokedex_entries_mapping("pokedexEntryId");
+
+-- Enable RLS
+ALTER TABLE pokedex_entries_mapping ENABLE ROW LEVEL SECURITY;
+
+-- RLS Policies
+
+-- Public read access (mapping is reference data)
+CREATE POLICY "Anyone can view pokedex entries mapping"
+  ON pokedex_entries_mapping
+  FOR SELECT USING (true);
+
+-- Users can only insert mappings for their own pokedexes
+CREATE POLICY "Users can insert own pokedex mappings"
+  ON pokedex_entries_mapping
+  FOR INSERT WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM pokedexes
+      WHERE pokedexes.id = pokedex_entries_mapping."pokedexId"
+      AND pokedexes."userId" = auth.uid()
+    )
+  );
+
+-- Users can only delete mappings for their own pokedexes
+CREATE POLICY "Users can delete own pokedex mappings"
+  ON pokedex_entries_mapping
+  FOR DELETE USING (
+    EXISTS (
+      SELECT 1 FROM pokedexes
+      WHERE pokedexes.id = pokedex_entries_mapping."pokedexId"
+      AND pokedexes."userId" = auth.uid()
+    )
+  );