u

src/providers/mssql/purgeSql.js

@@ -1,6 +1,6 @@
 /** Drop order = reverse of schema create dependency order. */
 export const TABLES = [
-  
+  'healthcheck',
   'articlewarehousesummary',
   'deliverysummary',
   'shipmentsummary',

src/providers/mssql/queries/healthcheck.js

@@ -0,0 +1,19 @@
+export const ENSURE_ROW = `
+IF NOT EXISTS (SELECT 1 FROM healthcheck)
+BEGIN
+    INSERT INTO healthcheck ([sequence]) VALUES (0);
+END
+`;
+
+export const SELECT_FOR_UPDATE = `
+SELECT TOP 1 id, [sequence]
+FROM healthcheck WITH (UPDLOCK, ROWLOCK)
+ORDER BY id ASC;
+`;
+
+export const UPDATE_SEQUENCE = `
+UPDATE healthcheck
+SET [sequence] = @sequence,
+    updated_at = SYSUTCDATETIME()
+WHERE id = @id;
+`;

src/providers/mssql/schema.js

@@ -1437,8 +1437,20 @@ BEGIN
 END
 `;
 
+export const INIT_HEALTHCHECK = `
+IF NOT EXISTS (SELECT * FROM sys.tables WHERE name = 'healthcheck')
+BEGIN
+    CREATE TABLE healthcheck (
+        id INT IDENTITY(1,1) PRIMARY KEY,
+        [sequence] BIGINT NOT NULL CONSTRAINT DF_healthcheck_sequence DEFAULT 0,
+        updated_at DATETIME2 NOT NULL CONSTRAINT DF_healthcheck_updated_at DEFAULT SYSUTCDATETIME()
+    );
+END
+`;
+
 /** DDL scripts in dependency order for schema init. */
 export const SCHEMA_SCRIPTS = [
+    INIT_HEALTHCHECK,
     INIT_META,
     INIT_LANGUAGE,
     INIT_TAX,

src/providers/sqlite3/queries/healthcheck.js

@@ -0,0 +1,24 @@
+import * as source from '../../mssql/queries/healthcheck.js';
+import { translateQueries } from './translate.js';
+
+const queries = translateQueries(source, 'healthcheck');
+
+export const ENSURE_ROW = `
+INSERT INTO healthcheck (id, "sequence")
+SELECT 1, 0
+WHERE NOT EXISTS (SELECT 1 FROM healthcheck);
+`;
+
+export const SELECT_FOR_UPDATE = `
+SELECT id, "sequence"
+FROM healthcheck
+ORDER BY id ASC
+LIMIT 1;
+`;
+
+export const UPDATE_SEQUENCE = `
+UPDATE healthcheck
+SET "sequence" = @sequence,
+    updated_at = strftime('%Y-%m-%dT%H:%M:%fZ', 'now')
+WHERE id = @id;
+`;

src/providers/sqlite3/schema.js

@@ -1058,8 +1058,17 @@ CREATE TABLE IF NOT EXISTS subagentschedule (
 CREATE INDEX IF NOT EXISTS IX_subagentschedule_company ON subagentschedule (company_id);
 `;
 
+export const INIT_HEALTHCHECK = `
+CREATE TABLE IF NOT EXISTS healthcheck (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    "sequence" INTEGER NOT NULL DEFAULT 0,
+    updated_at TEXT NOT NULL DEFAULT (${UTC_NOW})
+);
+`;
+
 /** DDL scripts in dependency order for SQLite schema initialization. */
 export const SCHEMA_SCRIPTS = [
+    INIT_HEALTHCHECK,
     INIT_META,
     INIT_LANGUAGE,
     INIT_TAX,