adds Cargo.lock, updates gitignore, updates SCHEMA with initial table definitions for a couple of tables based on MODELS

.gitignore

@@ -6,7 +6,7 @@ target/
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
+# Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
@@ -14,3 +14,5 @@ Cargo.lock
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
 
+# No need to store databases in the git repo
+**/*.sqlite