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

SCHEMA.md

@@ -1 +1,53 @@
-# TODO
+# SCHEMA
+
+This file represents the initial schema for the various data structures to be stored in the database.
+
+These schema definitions target SQLite v3.
+
+# Persons Table
+The Persons table will contain data about Person entities (see MODELS.md)
+
+``` sql
+CREATE TABLE Persons (
+	id TEXT(36),    /* UUIDv4 */
+	remote_id TEXT, /* field to store an arbitrary remote identifier for this Person if they are not local */
+	name TEXT,      /* "real" name */
+	handle TEXT,    /* also commonly refered to as 'display_name' or 'screen_name', optional (if missing, name will be used as handle) */
+	is_active INTEGER DEFAULT (1),    /* bool, default true */
+	is_blocked INTEGER DEFAULT (0),   /* bool, default false */
+	created_at INTEGER,               /* timestamp */
+	modified_at INTEGER,              /* timestamp */
+	modified_by TEXT(36),             /* UUIDv4 */
+	deleted_at INTEGER,               /* timestamp */
+	deleted_by TEXT(36),              /* UUIDv4 */
+	last_seen INTEGER,                /* timestamp */
+	shipping_address TEXT,            /* optional, should use \n between lines to keep localized format as needed */
+	CONSTRAINT Persons_PK PRIMARY KEY (id),
+	CONSTRAINT Persons_FK FOREIGN KEY (modified_by) REFERENCES Persons(id),
+	CONSTRAINT Persons_FK_1 FOREIGN KEY (deleted_by) REFERENCES Persons(id)
+);
+CREATE UNIQUE INDEX Persons_remote_id_IDX ON Persons (remote_id);
+CREATE INDEX Persons_name_IDX ON Persons (name);
+CREATE INDEX Persons_handle_IDX ON Persons (handle);
+CREATE INDEX Persons_is_active_IDX ON Persons (is_active);
+CREATE INDEX Persons_is_blocked_IDX ON Persons (is_blocked);
+CREATE INDEX Persons_deleted_at_IDX ON Persons (deleted_at);
+```
+
+# PersonEmails Table
+The PersonEmails table is a one-to-many lookup table relating a Person to zero or more email addresses
+
+``` sql
+CREATE TABLE PersonEmails (
+	person_id TEXT(36),
+	email TEXT,
+	is_verified INTEGER DEFAULT (0),
+	is_primary INTEGER DEFAULT (0),
+	CONSTRAINT PersonEmails_PK PRIMARY KEY (email),
+	CONSTRAINT PersonEmails_FK FOREIGN KEY (person_id) REFERENCES Persons(id) ON DELETE CASCADE
+);
+CREATE INDEX PersonEmails_person_id_IDX ON PersonEmails (person_id);
+CREATE INDEX PersonEmails_is_verified_IDX ON PersonEmails (is_verified);
+CREATE INDEX PersonEmails_is_primary_IDX ON PersonEmails (is_primary);
+```
+