From e3020fbe2ccaabf1d596c01a629bd93b3094e920 Mon Sep 17 00:00:00 2001
From: Pranav <pranav@chatwoot.com>
Date: Fri, 19 Sep 2025 00:09:17 -0700
Subject: [PATCH] fix: Use case sensitive filter for phone_numbers (#12470)
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The contact filter APIs were timing out due to the case‑insensitive
filter. There is no index for lower case phone numbers, so it would
perform a table scan, potentially examining 8 million records or more at
a time.

This change should fix the issue.
I am changing the filter to use direct comparison without lower‑case.

**Previous:**
```sql
SELECT contacts.*
FROM contacts
WHERE contacts.account_id = $1
  AND (
    LOWER(contacts.phone_number) = '<number>'
    OR LOWER(contacts.phone_number) = '<other-number>'
  )
ORDER BY contacts.created_at DESC NULLS LAST
LIMIT $2
OFFSET $3
```

**Updated:**
```sql
SELECT contacts.*
FROM contacts
WHERE contacts.account_id = $1
  AND (
    contacts.phone_number = '<number>'
    OR contacts.phone_number = '<other-number>'
  )
ORDER BY contacts.created_at DESC NULLS LAST
LIMIT $2
OFFSET $3
```

Fixes:
https://linear.app/chatwoot/issue/CW-5582/contact-filter-timing-out
---
 Gemfile.lock                | 2 +-
 lib/filters/filter_keys.yml | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Gemfile.lock b/Gemfile.lock
index f9e253e6c..16e57d4f8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -727,7 +727,7 @@ GEM
     retriable (3.1.2)
     reverse_markdown (2.1.1)
       nokogiri
-    rexml (3.4.1)
+    rexml (3.4.4)
     rotp (6.3.0)
     rspec-core (3.13.0)
       rspec-support (~> 3.13.0)
diff --git a/lib/filters/filter_keys.yml b/lib/filters/filter_keys.yml
index 902b5f219..626a0cbd5 100644
--- a/lib/filters/filter_keys.yml
+++ b/lib/filters/filter_keys.yml
@@ -4,7 +4,7 @@
 # 3. Automation Filters  (app/services/automation_rules/conditions_filter_service.rb), (app/services/automation_rules/condition_validation_service.rb)
 
 
-# Format 
+# Format
 # - Parent Key (conversation, contact, messages)
 #   - Key (attribute_name)
 #     - attribute_type: "standard" : supported ["standard", "additional_attributes (only for conversations and messages)"]
@@ -138,7 +138,7 @@ contacts:
       - "does_not_contain"
   phone_number:
     attribute_type: "standard"
-    data_type: "text_case_insensitive"
+    data_type: "text" # Text is not explicity defined in filters, default filter will be used
     filter_operators:
       - "equal_to"
       - "not_equal_to"