modify db and add doc for it

src/schema.sql

@@ -7,7 +7,7 @@ CREATE TABLE IF NOT EXISTS plugin_materiels_category (
 CREATE TABLE IF NOT EXISTS plugin_materiels_equipment (
 	id                   integer NOT NULL  PRIMARY KEY autoincrement,
 	category_id          integer NOT NULL,
-	number_of_equipments integer NOT NULL,
+	stock_number         integer NOT NULL,
 	designation          varchar(255) NOT NULL,
 	CONSTRAINT u_equipment_designation UNIQUE ( designation ),
 	FOREIGN KEY ( category_id ) REFERENCES plugin_materiels_category( id ) ON DELETE RESTRICT ON UPDATE CASCADE
@@ -16,17 +16,19 @@ CREATE TABLE IF NOT EXISTS plugin_materiels_equipment (
 CREATE TABLE IF NOT EXISTS plugin_materiels_entry (
  	id                   integer NOT NULL  PRIMARY KEY autoincrement,
  	kind                 varchar(20) NOT NULL,
-	number_of_equipments integer NOT NULL,
+	equipment_number     integer NOT NULL,
  	equipment_id         integer NOT NULL,
- 	date_of_entry        date NOT NULL,
+ 	entry_date           date NOT NULL,
+	additional_comment   varchar(255),
  	FOREIGN KEY ( equipment_id ) REFERENCES plugin_materiels_equipment( id ) ON DELETE RESTRICT ON UPDATE CASCADE
 );
 
 CREATE TABLE IF NOT EXISTS plugin_materiels_output (
 	id                   integer NOT NULL  PRIMARY KEY autoincrement,
 	kind                 varchar(20) NOT NULL,
-	number_of_equipments integer NOT NULL,
+	equipment_number     integer NOT NULL,
 	equipment_id         integer NOT NULL,
 	output_date          date NOT NULL,
+	additional_comment   varchar(255),
 	FOREIGN KEY ( equipment_id ) REFERENCES plugin_materiels_equipment( id ) ON DELETE RESTRICT ON UPDATE CASCADE
 );