Fix: Properties Fetch Timeout Error ✅

Problem

Users experiencing database timeout error when loading properties:

Error: {
  code: '57014',
  message: 'canceling statement due to statement timeout'
}

Root Causes

1. Large Dataset: 1680+ properties being fetched at once
2. Missing Indexes: Database performing full table scans
3. Batching Overhead: Multiple sequential queries in a loop
4. Statement Timeout: Default Supabase timeout too short for query

Solutions Implemented

1. ✅ Optimized fetchProperties Function

Changes Made:

• Removed batch fetching loop (was causing multiple slow queries)
• Changed to single optimized query with .limit(5000)
• Explicitly selected only needed columns (no SELECT *)
• Added 30-second client-side timeout with AbortController
• Better error handling for timeout scenarios
• Added fallback empty state if query fails

Before:

// Old approach - multiple queries in a loop
while (hasMore) {
  const { data, error } = await supabase
    .from('properties')
    .select('*')
    .range(from, from + batchSize - 1);
  // ... accumulate results
}

After:

// New approach - single optimized query
const { data, error } = await supabase
  .from('properties')
  .select(`
    id,
    property_name,
    address,
    city,
    state,
    // ... specific columns
  `)
  .order('created_at', { ascending: false })
  .limit(5000)
  .abortSignal(abortController.signal);

2. ✅ Database Indexes (SQL Script)

Created database/fixes/FIX_PROPERTIES_TIMEOUT.sql with strategic indexes:

Critical Indexes:

1. idx_properties_created_at - For ORDER BY sorting ⭐ Most Important
2. idx_properties_name - For property name searches
3. idx_properties_city - For city filtering
4. idx_properties_address - For address searches
5. idx_properties_status - For status filtering
6. idx_properties_management_type - For management type filtering
7. idx_properties_state_city - Composite index for common patterns
8. idx_properties_pm_company_id - Foreign key lookups
9. idx_properties_owner_contact_id - Foreign key lookups

Run the SQL script:

# In Supabase SQL Editor, run:
# database/fixes/FIX_PROPERTIES_TIMEOUT.sql

3. ✅ Error Handling Improvements

Added specific error messages:

• AbortError → User-friendly timeout message
• Code 57014 → Database timeout with support contact info
• Graceful fallback to empty state

4. ✅ Performance Monitoring

Added console logging:

🔄 Starting property fetch...
✅ Fetched 1680 properties from Supabase

How to Apply the Fix

Step 1: Code Changes (Already Applied)

The optimized fetchProperties function is now in app/access-crm/page.tsx

Step 2: Database Indexes (YOU NEED TO RUN THIS)

1. Open Supabase Dashboard
2. Go to SQL Editor
3. Copy contents of database/fixes/FIX_PROPERTIES_TIMEOUT.sql
4. Run the script
5. Verify indexes were created:

SELECT indexname, indexdef 
FROM pg_indexes 
WHERE tablename = 'properties';

Step 3: Test

1. Refresh the application
2. Navigate to Properties tab
3. Check browser console for success message
4. Properties should load within 2-5 seconds

Expected Performance Improvements

Metric	Before	After	Improvement
Query Time	60+ seconds (timeout)	2-5 seconds	92% faster
Number of Queries	Multiple (batch loop)	Single query	1 query
Columns Selected	All (SELECT *)	Only needed	Smaller payload
Index Usage	Sequential scan	Index scan	Much faster

Verification

Check if Indexes are Working

Run this in Supabase SQL Editor:

EXPLAIN ANALYZE
SELECT id, property_name, address, city, state, 
       created_at
FROM properties
ORDER BY created_at DESC
LIMIT 5000;

Expected Output:

• Should say: Index Scan using idx_properties_created_at
• Should NOT say: Seq Scan on properties

Check Query Performance

SELECT 
  query,
  calls,
  total_time,
  mean_time,
  max_time
FROM pg_stat_statements 
WHERE query LIKE '%properties%'
ORDER BY mean_time DESC
LIMIT 10;

Troubleshooting

If Timeout Still Occurs

1. Increase Supabase Statement Timeout:

   • Go to Supabase Dashboard → Database Settings
   • Increase statement timeout to 60 seconds

2. Check Index Creation:

   SELECT indexname 
   FROM pg_indexes 
   WHERE tablename = 'properties';
   

   Should see all 9 indexes listed above

3. Reduce Limit: In fetchProperties, change:

   .limit(5000)  // Try .limit(2000)
   

4. Add Pagination: Consider loading properties in pages rather than all at once

Alternative Solutions (If Still Slow)

Option A: Server-Side Caching

Add Redis cache to store property data for 5 minutes

Option B: Incremental Loading

Load initial 500 properties, then load more on scroll

Option C: Database Views

Create a materialized view for faster reads

Option D: Edge Functions

Move heavy queries to Supabase Edge Functions

Files Modified

• ✅ app/access-crm/page.tsx - Optimized fetchProperties function
• ✅ database/fixes/FIX_PROPERTIES_TIMEOUT.sql - Database indexes script
• ✅ docs/troubleshooting/FIX_PROPERTIES_TIMEOUT.md - This documentation

Status

• ✅ Code optimization complete
• ⚠️ Database indexes need to be run in Supabase
• ⏳ Testing required after index creation

Next Steps

1. Run the SQL script in Supabase SQL Editor
2. Test the application - refresh and navigate to Properties tab
3. Monitor performance - check console logs
4. Report back if timeout still occurs

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Note: The most critical fix is creating the database indexes. The code optimization helps, but without indexes, large queries will always be slow.