El error enconcreto es este 🙂

Error: Please install pg package manually at ConnectionManager._loadDialectModule (/var/task/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:55:15) at new ConnectionManager (/var/task/node_modules/sequelize/lib/dialects/postgres/connection-manager.js:15:24) at new PostgresDialect (/var/task/node_modules/sequelize/lib/dialects/postgres/index.js:13:30) at new Sequelize (/var/task/node_modules/sequelize/lib/sequelize.js:194:20) at Object. (/var/task/src/config/database.js:4:19) at Module._compile (node:internal/modules/cjs/loader:1364:14) at Module._extensions..js (node:internal/modules/cjs/loader:1422:10) at Module.load (node:internal/modules/cjs/loader:1203:32) at Module._load (node:internal/modules/cjs/loader:1019:12) at /opt/rust/nodejs.js:2:12456 Node.js process exited with exit status: 1. The logs above can help with debugging the issue. Error: Please install pg package manually at ConnectionManager._loadDialectModule (/var/task/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:55:15) at new ConnectionManager (/var/task/node_modules/sequelize/lib/dialects/postgres/connection-manager.js:15:24) at new PostgresDialect (/var/task/node_modules/sequelize/lib/dialects/postgres/index.js:13:30) at new Sequelize (/var/task/node_modules/sequelize/lib/sequelize.js:194:20) at Object. (/var/task/src/config/database.js:4:19) at Module._compile (node:internal/modules/cjs/loader:1364:14) at Module._extensions..js (node:internal/modules/cjs/loader:1422:10) at Module.load (node:internal/modules/cjs/loader:1203:32) at Module._load (node:internal/modules/cjs/loader:1019:12) at /opt/rust/nodejs.js:2:12456 Node.js process exited with exit status: 1. The logs above can help with debugging the issue.

Tengo otras aplicaciones desplegadas correctamente con facilidad con pg y nunca me dieron problemas