Issue:
Bug: [Analytics] - Disputes fix psql





Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [x] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
adding dispute_amount column as int type because amount in dispute table is of string type on which we cannot have aggregation for analytics 


### Additional Changes

- [ ] This PR modifies the API contract
- [x] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
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## Motivation and Context
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## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
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-->run the migration, one column will be added to dispute table called dispute_amount as BIGINT type and will backfill from amount column which is string type


## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Testing:
run the migration, one column will be added to dispute table called dispute_amount as BIGINT type and will backfill from amount column which is string type

Patch:
diff --git a/crates/diesel_models/src/dispute.rs b/crates/diesel_models/src/dispute.rs
index 9bdac332295..eae8281a99d 100644
--- a/crates/diesel_models/src/dispute.rs
+++ b/crates/diesel_models/src/dispute.rs
@@ -29,6 +29,7 @@ pub struct DisputeNew {
     pub evidence: Option<Secret<serde_json::Value>>,
     pub profile_id: Option<String>,
     pub merchant_connector_id: Option<String>,
+    pub dispute_amount: i64,
 }
 
 #[derive(Clone, Debug, PartialEq, Serialize, Identifiable, Queryable)]
@@ -59,6 +60,7 @@ pub struct Dispute {
     pub evidence: Secret<serde_json::Value>,
     pub profile_id: Option<String>,
     pub merchant_connector_id: Option<String>,
+    pub dispute_amount: i64,
 }
 
 #[derive(Debug)]
diff --git a/crates/diesel_models/src/schema.rs b/crates/diesel_models/src/schema.rs
index 9e72d8dc21d..9db9f8c2d43 100644
--- a/crates/diesel_models/src/schema.rs
+++ b/crates/diesel_models/src/schema.rs
@@ -295,6 +295,7 @@ diesel::table! {
         profile_id -> Nullable<Varchar>,
         #[max_length = 32]
         merchant_connector_id -> Nullable<Varchar>,
+        dispute_amount -> Int8,
     }
 }
 
diff --git a/crates/router/src/core/webhooks.rs b/crates/router/src/core/webhooks.rs
index ef313b62228..9ec8de21f94 100644
--- a/crates/router/src/core/webhooks.rs
+++ b/crates/router/src/core/webhooks.rs
@@ -352,7 +352,7 @@ pub async fn get_or_update_dispute_object(
             let dispute_id = generate_id(consts::ID_LENGTH, "dp");
             let new_dispute = diesel_models::dispute::DisputeNew {
                 dispute_id,
-                amount: dispute_details.amount,
+                amount: dispute_details.amount.clone(),
                 currency: dispute_details.currency,
                 dispute_stage: dispute_details.dispute_stage,
                 dispute_status: event_type
@@ -374,6 +374,7 @@ pub async fn get_or_update_dispute_object(
                 profile_id: Some(business_profile.profile_id.clone()),
                 evidence: None,
                 merchant_connector_id: payment_attempt.merchant_connector_id.clone(),
+                dispute_amount: dispute_details.amount.parse::<i64>().unwrap_or(0),
             };
             state
                 .store
diff --git a/crates/router/src/db/dispute.rs b/crates/router/src/db/dispute.rs
index 0c34123b6f3..b0d0594c013 100644
--- a/crates/router/src/db/dispute.rs
+++ b/crates/router/src/db/dispute.rs
@@ -180,6 +180,7 @@ impl DisputeInterface for MockDb {
             profile_id: dispute.profile_id,
             evidence,
             merchant_connector_id: dispute.merchant_connector_id,
+            dispute_amount: dispute.dispute_amount,
         };
 
         locked_disputes.push(new_dispute.clone());
@@ -414,6 +415,7 @@ mod tests {
                 evidence: Some(Secret::from(Value::String("evidence".into()))),
                 profile_id: None,
                 merchant_connector_id: None,
+                dispute_amount: 1040,
             }
         }
 
diff --git a/migrations/2024-02-28-103308_add_dispute_amount_to_dispute/down.sql b/migrations/2024-02-28-103308_add_dispute_amount_to_dispute/down.sql
new file mode 100644
index 00000000000..e89bb9a356b
--- /dev/null
+++ b/migrations/2024-02-28-103308_add_dispute_amount_to_dispute/down.sql
@@ -0,0 +1,17 @@
+-- This file should undo anything in `up.sql`
+-- Drop the new column
+ALTER TABLE dispute
+DROP COLUMN IF EXISTS dispute_amount;
+
+-- Optionally, if you want to revert the UPDATE statement as well (assuming you have a backup)
+-- You can restore the original data from the backup or use the old values to update the table
+
+-- For example, if you have a backup and want to revert the changes made by the UPDATE statement
+-- You can replace the data with the backup data or the original values
+-- For demonstration purposes, we're assuming you have a backup table named dispute_backup
+
+-- Restore the original values from the backup or any other source
+-- UPDATE dispute
+-- SET dispute_amount = backup.dispute_amount
+-- FROM dispute_backup AS backup
+-- WHERE dispute.id = backup.id;
diff --git a/migrations/2024-02-28-103308_add_dispute_amount_to_dispute/up.sql b/migrations/2024-02-28-103308_add_dispute_amount_to_dispute/up.sql
new file mode 100644
index 00000000000..b56ffc4fe9c
--- /dev/null
+++ b/migrations/2024-02-28-103308_add_dispute_amount_to_dispute/up.sql
@@ -0,0 +1,8 @@
+-- Your SQL goes here
+-- Add the new column with a default value
+ALTER TABLE dispute
+ADD COLUMN dispute_amount BIGINT NOT NULL DEFAULT 0;
+
+-- Update existing rows to set the default value based on the integer equivalent of the amount column
+UPDATE dispute
+SET dispute_amount = CAST(amount AS BIGINT);