fix(test): stream large report snapshot SQL

Co-Authored-By: Claude Code <noreply@anthropic.com>

frontend/tests/helpers/postgres-fixture.ts

@@ -17,6 +17,7 @@ export type PostgresFixture = {
   connectionUrl(role: string, password: string): string;
   psql(sql: string): string;
   psqlAs(role: string, password: string, sql: string): string;
+  psqlScriptAs(role: string, password: string, sql: string): string;
   stop(): void;
 };
 
@@ -270,6 +271,37 @@ export function startPostgresFixture(): PostgresFixture {
         { encoding: "utf8", env: environment },
       ).trim();
     },
+    psqlScriptAs(role, password, sql) {
+      return execFileSync(
+        "docker",
+        [
+          ...composeArguments,
+          "exec",
+          "-T",
+          "-e",
+          `PGPASSWORD=${password}`,
+          "postgres",
+          "psql",
+          "-X",
+          "-At",
+          "-v",
+          "ON_ERROR_STOP=1",
+          "--single-transaction",
+          "-f",
+          "-",
+          "-U",
+          role,
+          "-d",
+          "jyotisha",
+        ],
+        {
+          encoding: "utf8",
+          env: environment,
+          input: sql,
+          maxBuffer: 16 * 1024 * 1024,
+        },
+      ).trim();
+    },
     stop() {
       try {
         execFileSync(