add postgres where clause for table data query.

add ui for where clause

TODO.md

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+# TODO
+
+## Databases
+
+- [ ] Fully support PostgreSQL and MySQL
+- [ ] Add support for SQLite
+- [ ] Add support for MSSQL
+- [ ] Add support for MongoDB
+- [ ] Add support for Redis
+
+## Nice to have
+
+- [ ] Seed database with fake data (something like mockaroo, but taking advantage of db introspection)